A304142 - OEIS

%I #6 Sep 16 2020 19:11:57

%S 0,7,18,61,1198,13152,6492,1429403,180869894,605470336,33123913586

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

%C Diagonal of A304149.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304149.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 07 2018