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%I #6 Aug 20 2020 11:34:25
%S 1,3,4,20,56,1162,17412,1045409,76908966,12262865881
%N Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C Diagonal of A300506.
%e Some solutions for n=5
%e ..0..1..0..1..1. .0..1..1..1..0. .0..1..1..0..0. .0..0..0..1..0
%e ..0..1..0..0..0. .0..0..1..1..0. .0..0..0..0..0. .1..0..0..0..1
%e ..1..1..0..0..0. .0..0..1..1..1. .0..0..1..1..0. .1..1..0..1..0
%e ..1..1..1..1..0. .0..0..0..1..1. .1..0..0..0..0. .1..1..0..0..1
%e ..0..1..1..1..1. .1..0..0..0..1. .1..0..0..1..0. .0..1..0..0..0
%Y Cf. A300506.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 07 2018