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Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
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%I #4 Jul 12 2018 11:42:03

%S 0,3,15,20,642,10850,58615,6782306,484120209,15199851129

%N Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A316757.

%e Some solutions for n=5

%e ..0..0..0..0..1. .0..1..1..0..1. .0..1..1..1..1. .0..1..0..1..0

%e ..0..1..0..0..1. .0..1..1..0..1. .0..1..1..0..1. .1..0..0..0..1

%e ..0..0..0..0..0. .1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0

%e ..1..0..0..1..0. .1..0..1..1..0. .1..1..1..1..1. .0..1..0..0..1

%e ..1..0..0..0..1. .0..1..1..1..0. .0..0..1..0..0. .0..0..0..1..0

%Y Cf. A316757.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 12 2018