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Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0

%I #4 Jul 23 2018 19:38:34

%S 1,4,23,959,127358,53479785,66735041323,247944910114486,

%T 2724578446333546605

%N Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A317215.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317215.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 23 2018