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

%I #6 Sep 16 2020 19:10:27

%S 0,3,6,26,596,3434,77360,4890117,181435839,30401698932

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

%C Diagonal of A304058.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304058.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 05 2018