%I
%S 0,1,2,64,2998,456649,209156119,280782187131,1114340919987573,
%T 12994612967873847001,446094799302794492462850
%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A300646.
%e Some solutions for n=5
%e ..0..0..0..0..1. .0..0..1..1..0. .0..0..0..0..0. .0..0..1..1..0
%e ..0..1..0..1..1. .0..0..1..0..0. .0..0..1..0..1. .0..1..1..0..0
%e ..1..1..0..1..1. .0..1..1..1..1. .0..1..1..1..1. .0..0..0..1..1
%e ..1..1..0..1..0. .0..0..1..1..0. .0..1..0..0..0. .1..1..0..1..1
%e ..1..0..0..0..0. .0..0..1..0..0. .0..0..0..0..0. .1..0..0..1..1
%Y Cf. A300646.
%K nonn
%O 1,3
%A _R. H. Hardin_, Mar 10 2018
