A264660 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 5.

1, 3, 16, 148, 2400, 62800, 2150784, 89051520, 4376959488, 264110948352, 21288072222720, 1978778860130304, 210248229977210880, 24538416903912407040, 3332824425845079736320, 547095797465883534950400, 100573707310066947839754240, 20136119629662497380132454400, 4351515944148696555346880102400

Offset

1,2

Comments

Row 2 of A264659.

Links

Table of n, a(n) for n=1..19.

Example

Some solutions for n=5
..2..0..6..5..1....0..7..9..1..5....0..8..1..7..5....2..0..5..3..1
..8..4..3..9..7....2..8..4..6..3....2..4..6..3..9....4..6..8..9..7

Crossrefs

Cf. A264659.

Sequence in context: A121588 A331538 A306397 * A376578 A362655 A376576

Adjacent sequences: A264657 A264658 A264659 * A264661 A264662 A264663

Keyword

nonn

Author

R. H. Hardin, Nov 20 2015

Extensions

More terms from Bert Dobbelaere, May 10 2026

Status

approved