A299508 - OEIS

%I #6 Jun 15 2020 14:42:02

%S 0,3,15,112,2336,122197,17345466,4446967161,3109567007082

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A299514.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A299514.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 11 2018