%I #7 Oct 28 2020 19:05:11
%S 1,4,15,87,1054,21214,649029,33757130,2831764125,388624884126,
%T 87386482775870,32119546783363536,19300894647086693888
%N Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 5 or 7 king-move adjacent elements, with upper left element zero.
%C Diagonal of A304926.
%e Some solutions for n=5
%e ..0..1..1..1..1. .0..0..0..0..1. .0..0..1..0..0. .0..1..0..0..1
%e ..1..0..1..1..1. .0..0..0..1..0. .0..0..0..0..1. .0..0..0..1..0
%e ..1..1..1..1..0. .0..0..0..0..0. .1..0..0..0..0. .0..0..0..0..0
%e ..1..1..1..1..1. .1..0..0..0..1. .0..0..0..0..1. .0..0..0..1..0
%e ..1..1..1..0..1. .0..0..1..0..0. .0..0..1..0..0. .0..1..0..0..1
%Y Cf. A304926.
%K nonn
%O 1,2
%A _R. H. Hardin_, May 21 2018