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.

Showing 1-10 of 14 results. Next

A188242 Number of arrangements of n+2 nonzero numbers x(i) in -2..2 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

16, 20, 120, 300, 1284, 4132, 16272, 57808, 223308, 828456, 3193588, 12106616, 46777036, 179484068, 695670728, 2689241588, 10454975104, 40616587968, 158328346172, 617266507080, 2411727117520, 9427476168776, 36906793159556
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 2 of A188249

Examples

			Some solutions for n=4
.-2...-1...-1....2....2...-1....1...-1...-2....1....1...-1....1...-1....2...-2
..2....2...-1....1....1....2...-1....2....2...-2...-1....1....1....2....2....1
..1....1....1...-1....1....1....1....2....1...-1...-1....1...-2...-2...-1....2
.-1....1....2....1...-2...-2....2...-1....2....2...-2...-1...-2...-2....2...-1
.-1....1...-2....2....1...-2...-1...-2....2....2....2....1....1...-2....1....2
.-2...-2...-1...-1....1....1...-2....1...-2...-1....1....2...-1....1...-2....2

Links

A188243 Number of arrangements of n+2 nonzero numbers x(i) in -3..3 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

36, 52, 548, 1632, 12692, 51196, 355396, 1657632, 10858368, 54754656, 346608044, 1831830172, 11344750308, 61835276360, 377379008580, 2101523967056, 12697531716136, 71809422531596, 430895582983328, 2464705595705660
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 3 of A188249

Examples

			Some solutions for n=4
.-3....3....1...-3....2...-2...-2...-2....1...-2...-2....1....2...-3....2...-2
..2...-3....1...-2...-1...-3...-2...-1...-2....1...-2...-2...-3...-2....3....1
..2...-2...-2....3....2....3....2...-2....2...-2....2...-1...-1...-1...-3....2
..3...-1...-3....1....3...-2...-1....3....1...-3...-2...-3...-2....3...-1....1
.-2....1....1....3...-1...-3....1....2....1....2...-1....3....1...-1....2....2
.-1....2...-2...-2...-1...-1....3...-2....3....2...-2....2....3....2....1...-2

Links

A188244 Number of arrangements of n+2 nonzero numbers x(i) in -4..4 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

64, 144, 1504, 7092, 58824, 368588, 2880240, 20265640, 156028036, 1154193268, 8877588920, 67251222980, 518783061524, 3979996140580, 30813430250120, 238176520092556, 1850203922639624, 14371954026347848, 111969329295785092
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 4 of A188249

Examples

			Some solutions for n=5
..4...-4....2....4...-4....1....3....1....3...-3....2....4...-2....1...-1...-4
.-1....3...-1....3....1....4....2...-1...-2...-3....2....1...-2...-3....3....4
.-3....4...-2...-4...-3...-3....4....4...-1...-3....3...-1...-1...-1...-3....4
..3...-2...-3...-4...-2...-1...-2...-1....4....2...-2...-1...-1....4...-3...-4
..4...-4....2...-1...-4....1....3...-1....1...-2....2....4....1....1...-1...-3
.-1....4....4....4....1....3...-3...-2...-4....2....2....2...-2...-4...-2...-2
.-2....4...-2...-4...-3....1...-3...-3...-2...-2...-2...-4....2...-1....1....1

Links

A188245 Number of arrangements of n+2 nonzero numbers x(i) in -5..5 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

100, 208, 3292, 16484, 193232, 1399640, 14715004, 123729664, 1247614580, 11199296500, 110995324320, 1029900778912, 10129893228408, 95800929304216, 939159329686860, 8989025842005012, 88016972322771816, 849227228527469216
Offset: 1

Views

Author

R. H. Hardin, Mar 25 2011

Keywords

Comments

Column 5 of A188249.

Examples

			Some solutions for n=4
.-5....1....2...-4....4...-2....2....5....1...-2...-3...-1...-3....4...-1....2
..4....3....1...-2....3...-4...-5....2....4....5....5...-1....3...-2...-1....1
..4...-3...-3...-4...-2....2...-5...-1....4...-1....3....1...-1...-5....1....2
..5...-5...-2....4....3...-2....3....4...-1...-3....4....2...-5....1...-5...-2
.-4....1....5...-4....2....4....4....4....4...-2...-4....1...-1....1...-5....4
.-1...-4....1...-4...-3....3...-3...-5...-3...-3...-1...-4...-2....2....4....2

Links

A188246 Number of arrangements of n+2 nonzero numbers x(i) in -6..6 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

144, 436, 6376, 43440, 521124, 4875112, 55994544, 591604824, 6764014136, 75116513672, 862566555260, 9803647311540, 113184217957288, 1302374837233636, 15107289166289400, 175125528108662876, 2039302796727309112
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 6 of A188249

Examples

			Some solutions for n=4
.-6...-2...-2...-1....5....2....6...-1...-1...-2...-6....4....2...-6....6...-4
..6...-1...-2....2...-1....3....3...-2...-6...-4...-3...-3....6....3....3...-2
..3...-2....5....2....2....1....3...-6...-6....4....6...-6....4....6....3...-4
.-2...-1....3...-6...-1...-3...-1....3....3....4....5....4...-5...-1...-6....4
.-3....1...-1...-2...-3....6...-6....1...-3...-1...-3....2....2...-3....1....5
.-6...-5....6....1...-2....2....5....1....5....4....5....5...-3...-1...-3...-4

Links

A188250 Number of arrangements of 4 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

0, 20, 52, 144, 208, 436, 532, 816, 1072, 1508, 1668, 2400, 2592, 3220, 3940, 4768, 5024, 6212, 6500, 7856, 8944, 9988, 10340, 12384, 13280, 14516, 15796, 17824, 18272, 21156, 21636, 23712, 25472, 27124, 29124, 32800, 33376, 35220, 37300, 41136, 41776
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Row 2 of A188249

Examples

			Some solutions for n=4
.-2...-3...-1....1....3....1....2...-2....1....3....3....3...-2....2...-4...-3
.-4...-1...-3...-4....2...-1....1...-3...-2...-2....1...-1....2...-3...-3...-1
..1...-3...-3...-4....3....1....2....1....1...-1....1....3....1...-1....3....1
.-4....2....4....3...-4....2...-2...-3....4...-4...-4....2....2...-3...-1...-2

Links

A188251 Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

12, 120, 548, 1504, 3292, 6376, 10564, 17040, 25436, 36808, 49556, 68912, 87804, 113384, 144644, 180912, 216044, 267160, 312404, 377904, 446588, 519976, 590420, 696576, 791164, 898456, 1016756, 1159280, 1278636, 1460936, 1598916, 1784224
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Row 3 of A188249

Examples

			Some solutions for n=4
..3...-2...-2...-3...-1...-1....1....1....4....1...-2...-4....2....2...-1...-3
.-3...-2....3...-4...-1...-3....3...-2....3...-2...-4...-2...-1....1...-1...-2
..2....3...-1....3....3....2....4...-4...-4...-1....2....1....2...-2....4....2
..3....1...-3...-2....2....1...-3....3...-2...-3...-4....3...-4...-4....3....2
..3...-1...-2...-3...-2....1....1....2....4....1...-2...-3...-3....2...-3...-3

Links

A188247 Number of arrangements of n+2 nonzero numbers x(i) in -7..7 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

196, 532, 10564, 75080, 1142180, 11953848, 168083116, 2026547348, 27843005992, 355600251460, 4851985495460, 63719148177636, 867980001700376, 11577646834184824, 157763834094118596
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 7 of A188249

Examples

			Some solutions for n=4
.-3...-1...-3....2....4...-6....5....3...-4....2...-1....4...-6...-6....3...-6
.-7...-7...-1...-1...-1...-1...-1....6...-5...-5....1....3...-6....3...-1...-4
..1....2...-6...-2....2...-6....1...-1....3....6...-2...-6....3....2...-2....3
..4....6...-2....3....5....1....4...-6...-3....2....2...-5...-6....6....4...-2
.-2....5....3....3....2....2...-2....2....2....7....7....3...-7....1....3...-6
..5...-7...-5...-1...-7...-4...-5...-3....5....2...-1...-3....6...-6...-1....3

A188248 Number of arrangements of n+2 nonzero numbers x(i) in -8..8 with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

256, 816, 17040, 142532, 2347608, 28779900, 445304272, 6250275112, 95625385124, 1414314289436
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Column 8 of A188249

Examples

			Some solutions for n=4
.-8....2....4...-2...-6....3...-5...-2....4...-7...-2....1...-5....7....7....2
.-5...-5....2...-5...-2...-2....2...-7....6....2....7...-6....4...-4...-4...-6
..4...-1...-2...-4...-7...-5...-2...-1....4....8...-7...-1...-8....8....7...-6
..3....3...-1...-6....6...-2...-7....1...-5...-1...-1....2...-4....7....8....5
..8....2...-6....6....8...-7...-8....4....7...-2...-8....2...-4....4....4....3
.-7....1....2...-3...-4....4....7...-6....1...-2...-6...-1...-1...-6...-8...-3

A188252 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

0, 300, 1632, 7092, 16484, 43440, 75080, 142532, 232432, 380244, 525668, 841504, 1099064, 1531092, 2070976, 2785252, 3396316, 4539424, 5414024, 6981628, 8554708, 10387240, 11982424, 15101088, 17498972
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Row 4 of A188249

Examples

			Some solutions for n=4
.-4....2...-4...-1....2....4....3....4....3....3....1...-3...-1...-2...-3....3
..1...-3...-2....2...-1...-1....1...-2...-2....4...-4....3....3....3...-1...-4
.-2...-3...-4...-1...-2...-2...-2....2....2....4...-4....1...-2....1...-2...-4
.-4....3....4...-4....1....2...-4...-2...-1...-2....1....2....3....3....2...-4
..1....3...-3...-3...-1....2....3...-4...-4....4...-4...-4....3....1....1....4
..2...-1...-4....4...-3....1....1...-2...-2...-3....1...-3....2...-3...-3...-1
Showing 1-10 of 14 results. Next

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