A303176 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 31, 297, 5613, 218980, 11901719, 1341217380, 375045359077, 204902495620748, 208094348433251495

Offset

1,2

Comments

Diagonal of A303182.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A303182.

Sequence in context: A121093 A296830 A232621 * A209484 A209343 A270523

Adjacent sequences: A303173 A303174 A303175 * A303177 A303178 A303179

Keyword

nonn

Author

R. H. Hardin, Apr 19 2018

Status

approved