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.

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A027122 a(n) = A027113(n, 2n-4).

Original entry on oeis.org

1, 2, 7, 24, 77, 241, 738, 2227, 6650, 19711, 58114, 170682, 499911, 1461284, 4265437, 12438449, 36247956, 105589899, 307513742, 895514715, 2607925982, 7595726764, 22127052759, 64473303788, 187912261301, 547850119836
Offset: 2

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Author

Clark Kimberling

Keywords

A027123 a(n) = A027113(n, 2n-5).

Original entry on oeis.org

1, 4, 13, 44, 145, 467, 1475, 4588, 14099, 42919, 129685, 389578, 1164909, 3470513, 10309111, 30551216, 90368547, 266900346, 787325255, 2320267136, 6832609927, 20108081817, 59149096985, 173927024292, 511290023185
Offset: 3

Views

Author

Clark Kimberling

Keywords

A027124 a(n) = A027113(n, 2n-6).

Original entry on oeis.org

1, 2, 7, 24, 81, 270, 886, 2861, 9109, 28652, 89211, 275420, 844320, 2573161, 7803656, 23569375, 70941900, 212911167, 637427166, 1904416809, 5679745126, 16913962409, 50304623519, 149450737592, 443593524167, 1315613998440
Offset: 3

Views

Author

Clark Kimberling

Keywords

A027125 a(n) = A027113(n, 2n-7).

Original entry on oeis.org

1, 4, 13, 44, 149, 500, 1660, 5444, 17640, 56524, 179322, 563932, 1759982, 5456608, 16821309, 51600720, 157615653, 479664388, 1455061181, 4401607356, 13282579293, 39997017088, 120215762283, 360730451088, 1080880047091
Offset: 4

Views

Author

Clark Kimberling

Keywords

A027126 a(n) = A027113(n, 2n-8).

Original entry on oeis.org

1, 2, 7, 24, 81, 274, 923, 3087, 10232, 33587, 109190, 351730, 1123465, 3561045, 11210036, 35073033, 109137568, 337969627, 1042129366, 3201226811, 9800475386, 29914121676, 91063951213, 276556071836, 838101477953
Offset: 4

Views

Author

Clark Kimberling

Keywords

A027127 a(n) = A027113(n, 2n-9).

Original entry on oeis.org

1, 4, 13, 44, 149, 504, 1701, 5715, 19079, 63218, 207803, 677598, 2192383, 7041688, 22463815, 71216406, 224495351, 704036264, 2197641219, 6831066997, 21152812449, 65276358340, 200814955029, 616052453764, 1885109044861
Offset: 5

Views

Author

Clark Kimberling

Keywords

A027128 a(n) = A027113(n, 2n-10).

Original entry on oeis.org

1, 2, 7, 24, 81, 274, 927, 3132, 10552, 35395, 118065, 391320, 1288260, 4212091, 13679558, 44141377, 141571286, 451475589, 1432198967, 4521270066, 14209424215, 44474645476, 138681426899, 430955113144, 1334997086607
Offset: 5

Views

Author

Clark Kimberling

Keywords

Crossrefs

Cf. A027113.

A027130 a(n) = Sum_{0<=j<=i<=n} A027113(i, n+j).

Original entry on oeis.org

1, 4, 13, 40, 119, 350, 1022, 2973, 8635, 25074, 72850, 211875, 616985, 1799092, 5253127, 15358500, 44958889, 131759776, 386557548, 1135204289, 3336791503, 9816315842, 28900431835, 85147344488, 251030187583, 740539502786
Offset: 0

Views

Author

Clark Kimberling

Keywords

Crossrefs

Partial sums of A027129.

Extensions

Title corrected by Sean A. Irvine, Oct 23 2019

A027131 a(n) = diagonal sum of left justified array T given by A027113.

Original entry on oeis.org

1, 1, 2, 4, 4, 8, 11, 15, 24, 35, 48, 75, 108, 152, 232, 336, 477, 721, 1046, 1496, 2245, 3264, 4690, 7006, 10200, 14709, 21897, 31916, 46148, 68523, 99962, 144841, 214634, 313327, 454756, 672803, 982718, 1428225, 2110278, 3083747, 4486717, 6622251, 9680743, 14098072, 20789712
Offset: 0

Views

Author

Clark Kimberling

Keywords

Formula

a(n) = Sum_{k=0..n} A027113(n-k, k). - Sean A. Irvine, Oct 23 2019

Extensions

More terms from Sean A. Irvine, Oct 23 2019

A027132 a(n) = diagonal sum of right justified array T given by A027113.

Original entry on oeis.org

1, 2, 4, 12, 27, 70, 182, 477, 1269, 3413, 9249, 25255, 69389, 191680, 532026, 1482926, 4148949, 11647260, 32797042, 92608175, 262157690, 743845685, 2115093984, 6026041793, 17199956143, 49176678286, 140824260498, 403865784020
Offset: 0

Views

Author

Clark Kimberling

Keywords

Previous Showing 11-20 of 32 results. Next

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

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