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Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0

%I #4 Jul 27 2018 22:07:57

%S 0,7,61,1140,67214,8362442,2326497716,1648608723762,2852287084420935

%N Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A317436.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317436.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 27 2018