%I #6 Oct 20 2020 19:26:28
%S 0,7,56,918,37050,2753404,389403912,111681916203,65358224695742
%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.
%C Diagonal of A304697.
%e Some solutions for n=5
%e ..0..1..0..0..1. .0..1..1..0..1. .0..1..1..0..0. .0..0..1..0..1
%e ..0..0..0..0..0. .0..1..1..0..0. .1..0..1..1..0. .1..0..1..1..1
%e ..0..0..0..0..0. .1..0..1..1..0. .0..1..1..1..1. .1..1..1..1..0
%e ..1..1..0..1..1. .0..1..0..1..0. .1..0..1..1..1. .0..1..1..1..1
%e ..1..0..0..1..0. .0..0..1..0..0. .0..1..1..1..0. .1..1..0..1..0
%Y Cf. A304697.
%K nonn
%O 1,2
%A _R. H. Hardin_, May 17 2018