%I #7 Apr 20 2020 00:06:21
%S 1,3,12,36,139,1221,26184,746323,23967605,1285074158,140135122490,
%T 23444843868325,5152091496332058,1785689257359207106,
%U 1097023324108868377427,1066418515771155179484946
%N Number of n X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A303314.
%H R. H. Hardin, <a href="/A303308/b303308.txt">Table of n, a(n) for n = 1..17</a>
%e Some solutions for n=5
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1
%e ..0..1..0..1..0. .0..1..0..0..0. .0..1..0..0..0. .1..1..1..0..1
%e ..0..1..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..0..1..0..1
%e ..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .1..0..1..0..1
%e ..0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0. .1..0..1..0..1
%Y Cf. A303314.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 21 2018