A318076 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 5, 22, 51, 314, 1851, 15876, 139346, 1719340, 26691372, 570681324

Offset

1,2

Comments

Diagonal of A318082.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A318082.

Sequence in context: A203192 A025098 A025117 * A124423 A209109 A212260

Adjacent sequences: A318073 A318074 A318075 * A318077 A318078 A318079

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved