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 1-5 of 5 results.

A264701 Number of n X 1 arrays of permutations of 0..n-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 192, 576, 1728, 5184, 15552, 46656, 186624, 746496, 2985984, 11943936, 47775744, 191102976, 955514880, 4777574400, 23887872000, 119439360000, 597196800000, 2985984000000, 17915904000000, 107495424000000, 644972544000000
Offset: 1

Views

Author

R. H. Hardin, Nov 21 2015

Keywords

Comments

Column 1 of A264704.

Examples

			All solutions for n=8
..6....6....0....0
..0....0....6....6
..7....1....1....7
..1....7....7....1
..2....2....2....2
..3....3....3....3
..4....4....4....4
..5....5....5....5
		

Crossrefs

Cf. A264704.
Column k=6 of A275062.

Programs

  • Mathematica
    Table[Product[Floor[(n + i)/6]!, {i, 0, 5}], {n, 1, 40}] (* Vaclav Kotesovec, Oct 02 2018 *)

Formula

a(n) = Product_{i=0..5} floor((n+i)/6)!. - Alois P. Heinz, Jul 12 2016
a(n) ~ (2*Pi*n)^(5/2) * n! / 6^(n + 3). - Vaclav Kotesovec, Oct 02 2018

A264702 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

Original entry on oeis.org

1, 3, 6, 36, 288, 2240, 20736, 264384, 2892672, 63452160, 1528823808, 36691771392, 941182156800, 29143203840000, 803229696000000, 36978425856000000
Offset: 1

Views

Author

R. H. Hardin, Nov 21 2015

Keywords

Comments

Column 2 of A264704.

Examples

			Some solutions for n=7
..6..0....0..1....6..7....0..7...12..7...12..7....6..0...12..1....6..0....6.12
.12..7...12..2...12..1...12.13....0..1....0..1...12.13....6.13...12.13....0..7
.13..9....6..8....0.13....6..2....6.13....6..9....3..1....0..7....1..9...13..1
..1..3....7..9....2..8....1..3....8..9...13..3....9..7....2..9....7..3....8..3
..2..4...13..3....4..3....8..9....2..3....2..4....4..2....8.10....8..4....2..4
..8.10....4.11...10..9....4.10...10..4....8.10...10..8....3..5....2..5....9..5
..5.11...10..5....5.11...11..5....5.11....5.11...11..5....4.11...10.11...10.11
		

Crossrefs

Cf. A264704.

A264703 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

Original entry on oeis.org

2, 15, 296, 9024, 492480, 30233088, 3589152768, 470304423936, 94978179072000
Offset: 1

Views

Author

R. H. Hardin, Nov 21 2015

Keywords

Comments

Column 3 of A264704.

Examples

			Some solutions for n=4
..6..0..9....8..6..0....6..0..1....2..6..1....0..8.10....2..0..6....0..9..7
..8..1..3....2..7..1....7..9..3...10..0..7....6..2..4....8..1..3....6..4..1
..4..7..5....4..3..5....8.10..5....4..8..3....1..9.11...10..7..5....2.10..3
.10..2.11...10..9.11....2..4.11...11..5..9....7..3..5....4..9.11....8..5.11
		

Crossrefs

Cf. A264704.

A264705 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

Original entry on oeis.org

1, 3, 15, 212, 3712, 96256, 3423168, 158521536, 8362014912, 635861560320, 51551078842368
Offset: 1

Views

Author

R. H. Hardin, Nov 21 2015

Keywords

Comments

Row 2 of A264704.

Examples

			Some solutions for n=6
..2..0..8.10..7..1....8..0..6..1..7..3....0..6..4..3..9..7....4..6..8..0..7..9
..4..6..9.11..5..3....4.10..2..5.11..9....8..2.10..5.11..1...10..2.11..5..1..3
		

Crossrefs

Cf. A264704.

A264706 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

Original entry on oeis.org

1, 6, 296, 26304, 4689792, 1263257856, 603321053184
Offset: 1

Views

Author

R. H. Hardin, Nov 21 2015

Keywords

Comments

Row 3 of A264704.

Examples

			Some solutions for n=4
.10..8..0..7....8..6..0..7....6..0..8..2....4..0..2..1....0..1..7..9
..4..2..6..1....4..1..5..9....4..7..9..3...10..6..8..9....6..4..2..3
..5..3.11..9...10..2.11..3...10..1.11..5....5..7.11..3....8.10..5.11
		

Crossrefs

Cf. A264704.
Showing 1-5 of 5 results.