A298776 - OEIS

%I #6 Jun 15 2020 11:27:13

%S 1,1,6,4,37,562,9889,1477645,403292040,309941364263

%N Number of n X n 0..1 arrays with every element equal to 0, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298782.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298782.

%K nonn

%O 1,3

%A _R. H. Hardin_, Jan 26 2018