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Number of n X n 0..1 arrays with each 1 adjacent to 2 or 4 king-move neighboring 1's.
0

%I #6 Apr 26 2020 20:57:03

%S 1,5,31,204,8472,472540,39608385,10042412853,5131681923323,

%T 4854151578229861,10472350366798925062

%N Number of n X n 0..1 arrays with each 1 adjacent to 2 or 4 king-move neighboring 1's.

%C Diagonal of A296039.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A296039.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 03 2017