A303515 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 81, 420, 1596, 7951, 43448, 222205, 1111647, 5678762, 29269343, 150041512, 767385774, 3932021861, 20164462418, 103363694493, 529734973779, 2715304606630, 13919219193295, 71350445359330, 365738495870594

Offset

1,1

Comments

Row 4 of A303513.

Links

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

R. H. Hardin, Empirical recurrence of order 63

Formula

Empirical recurrence of order 63 (see link above)

Example

Some solutions for n=5
..0..1..1..0..0. .0..1..1..1..0. .0..1..0..1..0. .0..0..0..1..1
..1..0..0..0..1. .0..0..0..0..0. .0..1..0..1..1. .0..1..0..1..0
..1..0..1..0..1. .0..1..0..1..1. .0..0..1..0..0. .0..0..0..1..1
..0..0..1..0..0. .0..0..0..0..1. .0..1..0..1..0. .1..1..1..0..0

Crossrefs

Cf. A303513.

Sequence in context: A303018 A247536 A302822 * A027768 A236749 A343274

Adjacent sequences: A303512 A303513 A303514 * A303516 A303517 A303518

Keyword

nonn

Author

R. H. Hardin, Apr 25 2018

Status

approved