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Number of n X n 0..1 arrays with each 1 adjacent to 3 or 4 king-move neighboring 1's.
0

%I #6 Apr 26 2020 20:57:25

%S 1,2,6,16,503,29003,1993970,1061506422,1365762093736,2515747231264231

%N Number of n X n 0..1 arrays with each 1 adjacent to 3 or 4 king-move neighboring 1's.

%C Diagonal of A296115.

%e Some solutions for n=6

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

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

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

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

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

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

%Y Cf. A296115.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 04 2017