A302259 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 153, 5922, 429854, 64975832, 18964765818, 10943605799334, 12606633987588626

Offset

1,2

Comments

Diagonal of A302265.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A302265.

Sequence in context: A304400 A174845 A352253 * A113268 A356900 A191908

Adjacent sequences: A302256 A302257 A302258 * A302260 A302261 A302262

Keyword

nonn

Author

R. H. Hardin, Apr 04 2018

Status

approved