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%I #6 May 03 2020 15:42:12
%S 0,3,15,40,121,512,1708,7014,35804,201703,1158266,7391098,54852360
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
%C Diagonal of A298055.
%e Some solutions for n=5
%e ..0..0..1..0..0. .0..0..0..1..0. .0..0..0..1..0. .0..1..1..1..0
%e ..1..1..0..1..1. .1..1..1..0..1. .1..1..1..0..0. .1..0..0..0..1
%e ..0..1..1..1..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..0..0
%e ..0..1..0..1..0. .0..1..1..1..1. .0..1..0..1..0. .1..1..0..1..1
%e ..1..0..1..0..1. .1..1..1..0..0. .1..1..0..1..1. .1..0..1..0..1
%Y Cf. A298055.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 11 2018
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