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%I #6 May 03 2020 15:41:55
%S 0,4,48,466,5100,74675,1276012,30240388,1056360518,50037661325,
%T 3406737828874,353272517327686,52791942245108114
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
%C Diagonal of A297993.
%e Some solutions for n=6
%e ..0..0..1..0..0..0. .0..1..1..1..1..0. .0..1..0..0..1..0. .0..1..1..1..1..1
%e ..1..1..0..1..1..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .0..0..0..0..0..1
%e ..0..1..0..1..0..1. .1..1..1..0..1..1. .0..1..0..1..1..1. .1..1..1..1..1..0
%e ..0..0..0..1..0..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .1..0..0..0..0..1
%e ..0..1..0..1..1..0. .1..1..1..1..1..0. .0..1..0..1..0..1. .1..0..1..1..0..1
%e ..0..1..1..0..0..1. .0..0..0..0..0..0. .1..1..0..1..1..0. .1..1..0..1..0..1
%Y Cf. A297993.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 10 2018
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