A304413 - OEIS

%I #6 Sep 16 2020 19:14:59

%S 1,4,23,835,98568,32181958,29251894460,71613287309909,

%T 478060061219665260

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

%C Diagonal of A304419.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304419.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 12 2018