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 1-9 of 9 results.

A189186 T(n,k) = Number of n X k array permutations with each element making a single king move.

Original entry on oeis.org

0, 1, 1, 0, 9, 0, 1, 33, 33, 1, 0, 185, 192, 185, 0, 1, 913, 4081, 4081, 913, 1, 0, 4777, 47936, 251720, 47936, 4777, 0, 1, 24577, 733465, 10599449, 10599449, 733465, 24577, 1, 0, 127385, 9925824, 524539713, 1339732352, 524539713, 9925824, 127385, 0, 1
Offset: 1

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Author

R. H. Hardin, Apr 18 2011

Keywords

Comments

Table starts
.0.......1...........0................1.....................0
.1.......9..........33..............185...................913
.0......33.........192.............4081.................47936
.1.....185........4081...........251720..............10599449
.0.....913.......47936.........10599449............1339732352
.1....4777......733465........524539713..........212852911361
.0...24577.....9925824......24377674329........30863909708032
.1..127385...142150545....1162453545201......4646631858824169
.0..658801..1982789568...54868164490816....689003645197185280
.1.3410313.27997733409.2600517767888745.102804050401764094481

Examples

			Some solutions for 5X3
..3..2..1....3..5..4....1..3..4....1..0..5....4..0..1....3..2..1....3..0..5
..0..5..8....0..1..2....0..8..2....7..3..2....6..5..2....0..8..7....6..1..2
..9..6..4...10..6..7...10..6..5....4..9.11....9..3..7....4..9..5....7..8..4
.13.14..7...13..8.14....7.11.14....6.14..8...10..8.14....6.14.13...10.12.13
.10.12.11....9.12.11....9.12.13...10.12.13...13.12.11...10.12.11....9.14.11
		

Crossrefs

Cf. A189355.

A189348 Number of n X 2 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

1, 4, 13, 45, 160, 565, 2005, 7108, 25209, 89401, 317056, 1124425, 3987721, 14142276, 50154949, 177872293, 630816160, 2237161405, 7933993245, 28137553540, 99788579953, 353895752689, 1255075518976, 4451069407761, 15785519335825
Offset: 1

Views

Author

R. H. Hardin, Apr 20 2011

Keywords

Comments

Column 2 of A189355.

Examples

			Some solutions for 3 X 2:
..1..3....2..0....3..0....1..0....1..0....3..0....1..0....1..3....1..3....1..0
..0..5....3..1....5..1....4..5....3..5....4..1....4..2....5..0....0..2....3..2
..2..4....5..4....2..4....2..3....2..4....5..2....5..3....2..4....5..4....5..4
		

Crossrefs

Cf. A189355.

Formula

Empirical: a(n) = 3*a(n-1) +3*a(n-2) -3*a(n-3) -3*a(n-4) +a(n-5).
Empirical g.f.: x*(1 + x - 2*x^2 - 3*x^3 + x^4) / ((1 - x)*(1 - 2*x - 5*x^2 - 2*x^3 + x^4)). - Colin Barker, May 02 2018

A189349 Number of nX3 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

0, 13, 48, 557, 3632, 30769, 229248, 1815601, 13960720, 108880333, 843387440, 6554347309, 50856496800, 394905287105, 3065356528128, 23798261444545, 184745059744352, 1434227515809901, 11134091807034928, 86436190372455949
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 3 of A189355

Examples

			Some solutions for 4X3
..3..0..1....3..4..1....3..2..5....3..0..1....3..2..5....1..4..5....4..2..1
..7..5..2....0..8..2....0..7..1....4..8..2....7..0..1....0..8..2....0..5..8
.10..4.11....9.11..5....9..6..4....9.11..5....9.10..4...10..3.11....9..3.11
..6..9..8...10..6..7...10.11..8...10..6..7....6.11..8....6..9..7....6..7.10
		

Formula

Empirical: a(n) = 2*a(n-1) +41*a(n-2) +44*a(n-3) -118*a(n-4) +118*a(n-6) -44*a(n-7) -41*a(n-8) -2*a(n-9) +a(n-10)

A189350 Number of nX4 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

1, 45, 557, 12592, 237297, 4791913, 94635005, 1883785285, 37399042560, 743166198493, 14763119513829, 293302192368977, 5826899299462793, 115761639593312944, 2299800733947890517, 45689485687194056453
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 4 of A189355

Examples

			Some solutions for 3X4
..4..0..3..7....4..5..3..7....4..2..3..7....5..6..1..2....4..2..3..7
..8..1..5..2....0..6..1..2....5..0..1.11....0..9.10..3....0.10..1.11
..9.10.11..6....9..8.11.10....9..8..6.10....4..8.11..7....9..8..5..6
		

Formula

Empirical: a(n) = 8*a(n-1) +268*a(n-2) +100*a(n-3) -14506*a(n-4) -22855*a(n-5) +347444*a(n-6) +727264*a(n-7) -4361775*a(n-8) -10839894*a(n-9) +28941588*a(n-10) +87051904*a(n-11) -86750184*a(n-12) -379741329*a(n-13) +15880784*a(n-14) +854458520*a(n-15) +430764327*a(n-16) -969033120*a(n-17) -802207572*a(n-18) +802207572*a(n-19) +969033120*a(n-20) -430764327*a(n-21) -854458520*a(n-22) -15880784*a(n-23) +379741329*a(n-24) +86750184*a(n-25) -87051904*a(n-26) -28941588*a(n-27) +10839894*a(n-28) +4361775*a(n-29) -727264*a(n-30) -347444*a(n-31) +22855*a(n-32) +14506*a(n-33) -100*a(n-34) -268*a(n-35) -8*a(n-36) +a(n-37)

A189351 Number of nX5 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

0, 160, 3632, 237297, 10252800, 519621497, 24728774144, 1206541811872, 58289324009008, 2827118724742121, 136905250232923136, 6633862748392813081, 321370023775584504336, 15569943269307141603680, 754313155570494656470048
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 5 of A189355

Examples

			Some solutions for 3X5
..6..2..7..4..3....1..0..7..2..3....5..6..3..2..9....5..2..8..4..3
..0.11..1.14..8....6.11.12.14..4....0..1.13.14..4...10..0..1.13.14
..5.10.13.12..9....5.10.13..8..9...11.10..7.12..8...11..6..7.12..9
		

A189352 Number of nX6 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

1, 565, 30769, 4791913, 519621497, 64731638400, 7675175968337, 927311536349401, 111267210412798665, 13385995390731369181, 1608827786945127170673, 193432938477399402591673, 23253629565778621415892480
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 6 of A189355

Examples

			Some solutions for 3X6
..7..0..1.10..3..4....6..0..3..2..5.11....7..0..8..2..5.11....6..0..3..2..5.11
.12.14..2.15.11..5...12..8..1.15.16..4...12..1.15..3..4.17...12..1.14.15.16..4
.13..6..8..9.17.16...13.14..7..9.17.10....6.14.13.16..9.10...13..7..8..9.17.10
		

A189353 Number of nX7 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

0, 2005, 229248, 94635005, 24728774144, 7675175968337, 2239546267804672, 669245368116765065, 198265824869143635104, 58936758437348449273685, 17497862834694963378124992, 5197536868658118835508778253
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 7 of A189355

Examples

			Some solutions for 3X7
..1..2..3..4.11..6.13....1..2..3.10..5..4.13....1..0.10..2.11.12..5
..0..7.16..9.10.20..5...14..0..8.17.18.11..6...14..7.17.18..3..4..6
.15.14..8.18.17.12.19...15..7..9.16.19.20.12...15.16..8..9.19.20.13
		

A189354 Number of nX8 array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

1, 7108, 1815601, 1883785285, 1206541811872, 927311536349401, 669245368116765065, 494966160398383884544, 362995012557977063017785, 267122042433316923724049137, 196343414435260084855304091712
Offset: 1

Views

Author

R. H. Hardin Apr 20 2011

Keywords

Comments

Column 8 of A189355

Examples

			Some solutions for 3X8
..1..0..3..2.12.13..7..6....1..0..3..2..5.13.15..6....1..0..3.11..5..4..7.15
.16.17.11.19..4.22..5.14...16.10.18.20.21..4.23..7...16.18..2.19.20.12..6.23
..8..9.10.18.21.20.23.15...17..8..9.11.19.12.14.22...17..8..9.10.21.22.13.14
		

A189347 Number of n X n array permutations with each element moving one space diagonally, horizontally or vertically.

Original entry on oeis.org

0, 4, 48, 12592, 10252800, 64731638400, 2239546267804672, 494966160398383884544, 658664151315274081588459520, 5410532537689878793764236394523648, 271891121107496085701096037929377481809920
Offset: 1

Views

Author

R. H. Hardin, Apr 20 2011

Keywords

Examples

			Some solutions for 3 X 3:
..1..2..5....4..0..1....1..2..5....4..2..1....3..2..1....3..0..5....1..0..5
..0..8..4....6..3..2....7..0..8....0..5..8....4..0..8....6..1..2....6..8..2
..3..6..7....7..8..5....3..6..4....3..6..7....7..6..5....7..8..4....3..4..7
		

Crossrefs

Diagonal of A189355.

Extensions

a(9)-a(11) from Pontus von Brömssen, Aug 28 2024
Showing 1-9 of 9 results.