cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Previous Showing 11-20 of 23 results. Next

A208453 Meandric numbers for a river crossing up to 7 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 447, 1150, 3433, 9118, 27923, 75981, 237379, 658380, 2090519, 5888530, 18951534, 54069881, 176020213, 507632647, 1668910009, 4857449082, 16106998656, 47253245257, 157874165288, 466367068388, 1568587476660, 4661900731148, 15773729508730
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 7 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21)-a(36) from Andrew Howroyd, Dec 05 2015

A209383 Meandric numbers for a river crossing up to 8 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1151, 3450, 9137, 28134, 76236, 239712, 661374, 2115046, 5921549, 19203568, 54422726, 178585838, 511343777, 1694965469, 4896195579, 16371992897, 47656781437, 160578870274, 470571482142, 1596323368095, 4705798878362, 16059653893209
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 8 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21)-a(36) from Andrew Howroyd, Dec 05 2015

A209621 Meandric numbers for a river crossing up to 9 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3451, 9156, 28155, 76491, 240015, 664363, 2118804, 5954414, 19246816, 54772539, 179063855, 515006165, 1700131496, 4934242781, 16427135058, 48050970367, 161163698861, 474656662565, 1602509174036, 4748224219223, 16125057102402
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 9 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21)-a(36) from Andrew Howroyd, Dec 06 2015

A209622 Meandric numbers for a river crossing up to 10 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9157, 28176, 76514, 240318, 664718, 2122557, 5959052, 19289899, 54828151, 179538447, 515641437, 1705240090, 4941294887, 16481424379, 48127922888, 161736798007, 475487875843, 1608541737898, 4757151493126, 16188528696215
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 10 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=10 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21)-a(36) from Andrew Howroyd, Dec 06 2015

A209626 Meandric numbers for a river crossing up to 11 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28177, 76537, 240343, 665073, 2122968, 5963685, 19295541, 54883588, 179608831, 516272903, 1706070421, 4948280698, 16490889347, 48203859456, 161842379157, 476304741819, 1609703418480, 4765887074059, 16201200791291
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 11 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=11 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025

A209657 Meandric numbers for a river crossing up to 13 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240369, 665127, 2123408, 5964627, 19301713, 54897139, 179687084, 516448412, 1707004865, 4950415081, 16501638058, 48228801029, 161963084065, 476588705579, 1611037922998, 4769064680579, 16215807145689
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 13 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=13 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025

A209660 Meandric numbers for a river crossing up to 14 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665128, 2123437, 5964658, 19302248, 54897742, 179695133, 516457890, 1707112980, 4950547189, 16502992754, 48230509790, 161979310981, 476609746441, 1611226513378, 4769315213007, 16217954185533
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 14 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=14 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025

A209707 Meandric numbers for a river crossing up to 15 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123438, 5964689, 19302281, 54898345, 179695808, 516467363, 1707124038, 4950679082, 16503152306, 48232213024, 161981435856, 476630676669, 1611253336964, 4769563838975, 16218280461398
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 15 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=15 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025

A210344 Meandric numbers for a river crossing up to 16 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123439, 5964690, 19302314, 54898380, 179696483, 516468114, 1707135091, 4950691884, 16503311633, 48232404028, 161983554724, 476633293902, 1611280036392, 4769597694865, 16218604538134
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 16 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=16 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025

A210478 Meandric numbers for a river crossing up to 17 parallel roads at n points.

Original entry on oeis.org

1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123439, 5964691, 19302315, 54898415, 179696520, 516468865, 1707135922, 4950704681, 16503326351, 48232594797, 161983781556, 476635904628, 1611283232139, 4769631412013, 16218646880868
Offset: 0

Views

Author

Robert Price, May 07 2012

Keywords

Comments

Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 17 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.

Links

Crossrefs

Column k=17 of A380367.
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Cf. A076875, A076906, A076907.

Extensions

a(21) onwards from Andrew Howroyd, Jan 31 2025
Previous Showing 11-20 of 23 results. Next

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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