A302157 - OEIS

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A302157

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

1, 3, 7, 29, 140, 635, 2853, 19993, 75825, 786161, 2915241, 49663915, 152854596, 4893607560, 13149908952, 764803558904, 1748158857032, 193883417013099, 378301363005384, 78801036106269590, 130887347815375440

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A302163.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=5

..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..1. .0..0..1..1..0

..0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0

..0..1..0..1..0. .0..1..0..1..1. .1..1..0..1..0. .0..1..0..1..0