A317865 Number of nXn 0..1 arrays with every element unequal to 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 1, 26, 220, 4692, 163297, 13125877, 1146051177, 213068838812

Offset

1,4

Comments

Diagonal of A317871.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A317871.

Sequence in context: A126521 A242262 A241938 * A185553 A269658 A220714

Adjacent sequences: A317862 A317863 A317864 * A317866 A317867 A317868

Keyword

nonn

Author

R. H. Hardin, Aug 09 2018

Status

approved