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Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0

%I #7 Apr 05 2018 04:09:59

%S 0,3,22,89,1219,15862,384916,11370253,325745362,20953111994

%N Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A302278.

%e Some solutions for n=5:

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

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

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

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

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

%Y Cf. A302278.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 04 2018