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%I #10 Apr 22 2019 01:50:51
%S 1,8,228,19840,5304988,4358279956,10993944343316,85188280351091996,
%T 2027436931101188931860,148202875581543610186349592
%N Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A320371.
%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 0 0 1 1 0 0 0 0 0 0 1 1 0 1 0 1 1 0 0
%e 0 1 1 0 0 0 1 1 1 1 0 1 1 0 1 1 1 1 0 0
%e 0 1 1 0 0 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0
%e 1 0 0 1 0 0 0 0 0 0 0 1 0 1 0 0 1 0 0 0
%Y Cf. A320371.
%K nonn,more
%O 1,2
%A _R. H. Hardin_, Oct 11 2018
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