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A305643 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 0

%I

%S 1,5,13,137,5547,355620,283691091,724085314967,4577126359940051

%N Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

%C Diagonal of A305649.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305649.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 07 2018

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Last modified January 24 17:28 EST 2022. Contains 350565 sequences. (Running on oeis4.)