A266495 Number of 4 X n arrays containing n copies of 0..4-1 with no element 1 greater than its north, west, northwest or northeast neighbor modulo 4 and the upper left element equal to 0.

2, 4, 25, 133, 1094, 9358, 101927, 1164886, 16185022, 224916371, 3516365203, 53601466944, 875619141848, 13926085250073, 231472156648357, 3765127321086759, 63122767580658121, 1041182791473840225

Offset

1,1

Comments

Row 4 of A266493.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for n=4
..0..0..3..3....0..3..2..2....0..3..2..0....0..0..0..3....0..0..3..3
..2..2..2..2....3..2..1..1....3..2..2..2....0..3..3..3....3..3..2..2
..1..1..1..1....1..1..0..3....1..1..1..1....2..2..2..2....2..2..1..1
..0..0..3..3....0..0..3..2....0..0..3..3....1..1..1..1....1..1..0..0

Crossrefs

Cf. A266493.

Sequence in context: A001510 A103099 A342665 * A365097 A119029 A291144

Adjacent sequences: A266492 A266493 A266494 * A266496 A266497 A266498

Keyword

nonn

Author

R. H. Hardin, Dec 30 2015

Status

approved