%I #6 Aug 20 2020 11:50:35
%S 0,3,43,934,40395,3420704,553097760,177191137344,102914156897887,
%T 122108799039662692
%N Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A302224.
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1
%e ..1..1..1..1..1. .1..1..0..0..1. .1..1..1..0..1. .1..0..1..0..1
%e ..1..0..0..0..1. .1..1..1..1..1. .0..0..0..1..0. .0..1..1..0..0
%e ..0..1..1..1..0. .0..0..0..0..0. .1..1..0..1..1. .0..0..0..1..0
%e ..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .1..1..1..1..1
%Y Cf. A302224.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 03 2018