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

%I #6 Sep 16 2020 19:11:36

%S 1,4,5,11,39,39,48,11067,8405,540,15841950,66160098,1198599

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

%C Diagonal of A304141.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304141.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 07 2018