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%I #4 Jun 04 2018 11:52:12
%S 1,8,219,16480,3536750,2122076804,3592436519091,17139689875149747,
%T 230276333011388246524
%N Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
%C Diagonal of A305523.
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
%e ..0..0..1..0..1. .0..0..1..0..1. .0..0..1..1..1. .0..1..1..1..1
%e ..0..1..1..1..1. .0..1..1..1..0. .1..1..1..1..1. .1..1..1..0..0
%e ..1..1..1..1..1. .1..1..0..0..1. .1..1..1..0..0. .0..0..0..0..0
%e ..1..0..0..1..0. .0..0..0..0..0. .0..1..0..0..0. .0..1..0..1..0
%Y Cf. A305523.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jun 04 2018