|
%I #6 Sep 16 2020 19:07:14
%S 0,3,2,138,349,19068,99205,5047477,58634971,2949491750,84689499509,
%T 5678370893063
%N Number of n X n 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.
%C Diagonal of A303690.
%e Some solutions for n=5
%e ..0..1..1..0..1. .0..0..1..0..1. .0..1..0..1..0. .0..0..1..0..0
%e ..1..0..0..0..1. .1..1..1..1..0. .1..0..1..1..0. .1..1..1..1..1
%e ..0..1..0..0..1. .0..1..1..0..0. .0..0..0..1..1. .0..0..1..1..0
%e ..1..1..1..1..0. .0..0..0..0..1. .1..0..0..1..0. .0..0..0..0..0
%e ..0..0..1..0..1. .1..0..1..1..0. .1..0..1..0..1. .1..1..1..0..1
%Y Cf. A303690.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 28 2018
| 