A298721 - OEIS

%I #6 Jun 15 2020 11:24:37

%S 1,5,5,34,336,4001,76983,2232433,92349689,5607760208

%N Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298727.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298727.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 25 2018