%I #7 Apr 19 2020 23:59:25
%S 0,3,75,6638,2244335,2875574552,13930396115571,255391114062230046,
%T 17719358335864533713147,4652507709547839626397575180,
%U 4622990422099585649225050467889127
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A300930.
%H R. H. Hardin, <a href="/A300924/b300924.txt">Table of n, a(n) for n = 1..12</a>
%e Some solutions for n=5
%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
%e ..0..1..0..1..0. .0..1..0..0..1. .0..0..0..0..0. .0..0..1..0..1
%e ..1..1..1..0..0. .1..1..1..0..1. .1..1..1..1..0. .0..1..0..1..1
%e ..1..1..1..0..1. .1..0..0..1..1. .1..1..0..0..1. .1..1..0..1..1
%e ..0..0..0..1..1. .0..0..0..0..0. .1..1..1..1..1. .1..0..0..0..1
%Y Cf. A300930.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 15 2018