|
%I #6 Apr 26 2020 21:09:56
%S 1,2,8,46,852,74534,11172600,5380073625,8482089381228
%N Number of n X n 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1's.
%C Diagonal of A297020.
%e Some solutions for n=6
%e ..1..1..0..1..1..0. .1..1..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..1..0
%e ..1..1..1..0..1..1. .1..1..1..0..1..0. .0..1..1..1..1..1. .0..0..0..1..1..0
%e ..0..1..1..1..1..1. .0..0..0..1..1..1. .1..1..1..0..1..1. .0..0..1..0..0..0
%e ..0..0..0..0..0..0. .0..0..1..0..0..1. .1..1..0..1..0..1. .0..1..0..1..1..1
%e ..1..1..1..1..1..0. .0..1..1..0..1..1. .0..0..0..1..1..1. .1..1..0..0..1..1
%e ..1..1..0..1..1..0. .0..0..1..1..1..0. .0..0..0..0..1..1. .1..1..0..0..0..0
%Y Cf. A297020.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 23 2017
| 