|
%I #4 Aug 13 2018 14:29:01
%S 1,2,8,140,10563,2098813,1097286743,1507709268026,5360839557388973,
%T 49384396585140778697
%N Number of nXn 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A318045.
%e Some solutions for n=5
%e ..0..0..1..1..0. .0..1..0..0..0. .0..1..1..1..0. .0..1..0..1..0
%e ..0..1..0..1..0. .1..1..1..1..1. .1..0..0..1..1. .1..1..0..0..1
%e ..1..0..0..1..0. .0..0..1..0..1. .1..0..0..0..0. .0..0..0..1..0
%e ..0..0..0..1..0. .1..0..0..0..0. .0..1..1..1..0. .0..1..1..1..0
%e ..1..1..1..0..1. .0..1..1..0..1. .1..0..1..0..1. .1..0..0..0..1
%Y Cf. A318045.
%K nonn
%O 1,2
%A _R. H. Hardin_, Aug 13 2018
| 