%I #6 Jun 15 2020 15:08:01
%S 0,1,9,268,50419,30129628,73267622156,659976048146316,
%T 22262408061891336825,2806394212540208168079006
%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
%C Diagonal of A300175.
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..1. .0..0..0..1..1
%e ..0..1..1..1..0. .0..0..1..0..0. .0..0..1..1..1. .0..1..1..0..1
%e ..1..1..0..1..1. .1..1..1..0..0. .0..0..0..0..1. .1..1..1..1..0
%e ..1..0..1..0..1. .1..0..1..1..0. .0..1..0..1..0. .1..1..1..0..0
%e ..0..0..0..1..1. .0..0..1..0..0. .1..1..1..0..0. .1..1..0..0..0
%Y Cf. A300175.
%K nonn
%O 1,3
%A _R. H. Hardin_, Feb 27 2018