A305090 - OEIS

%I #6 Oct 28 2020 19:21:46

%S 0,3,14,20,333,7273,23368,566292,64803044,910350286,37491702178

%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A305097.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305097.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 25 2018