A295545 - OEIS

%I #6 Apr 26 2020 20:51:15

%S 1,5,34,598,23315,2094347,434357928,207301696580,228110991493680,

%T 578288109272844847,3378456566297565709729

%N Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.

%C Diagonal of A295551.

%e Some solutions for n=5

%e ..0..0..0..0..0. .1..0..1..1..0. .0..0..1..1..0. .1..0..1..1..0

%e ..0..0..1..1..0. .1..1..0..0..0. .0..0..0..0..1. .1..0..0..0..0

%e ..0..1..0..0..1. .1..0..0..1..0. .0..0..0..0..1. .0..0..1..0..0

%e ..1..1..1..0..1. .0..0..0..1..1. .1..0..1..1..0. .1..0..1..0..0

%e ..0..1..0..0..0. .1..1..0..1..0. .1..0..0..0..0. .1..0..0..1..1

%Y Cf. A295551.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 23 2017