A298555 - OEIS

%I #6 Jun 15 2020 11:13:33

%S 0,4,56,956,24364,983554,58699120,5376664548,755503324152

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

%C Diagonal of A298560.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298560.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 21 2018