A202912 Number of nX4 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

372, 1194376, 2397172032, 4062408076312, 7102116597811456, 12637286590945269232, 22397115742156661223732, 39623544474309263600520384, 70135184984660134580990756160, 124165374720618520973688261347828

Offset

1,1

Comments

Column 4 of A202916

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A299832 A203439 A265235 * A297383 A361344 A248799

Adjacent sequences: A202909 A202910 A202911 * A202913 A202914 A202915

Keyword

nonn

Author

R. H. Hardin Dec 26 2011

Status

approved