A305948 - OEIS

%I #4 Jun 15 2018 06:04:55

%S 1,4,23,959,126733,52618569,64233268442,231757210785889,

%T 2449990554327149088

%N Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A305954.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305954.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 15 2018