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

%I #4 Jul 09 2018 11:24:04

%S 0,3,15,42,3988,43604,1396674,331807728,22368384180,4961341851222

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

%C Diagonal of A316648.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A316648.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 09 2018