A298274 - OEIS

%I #6 May 03 2020 15:46:56

%S 0,4,129,10679,3214459,3328434344,11799327975543,143597352796799615,

%T 5998900161419245960408

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298280.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A298280.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 16 2018