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%I #6 Apr 05 2020 23:02:41
%S 2,52,720,10120,145822,2134812,31677488,474539092,7162528912,
%T 108751977400,1659266548448,25419213710160,390755520225882,
%U 6024619021179564,93124153758520074,1442654093474307468
%N Number of n X 4 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 one less than the number of 0's adjacent to some 1.
%C Column 4 of A284771.
%H R. H. Hardin, <a href="/A284767/b284767.txt">Table of n, a(n) for n = 1..173</a>
%e Some solutions for n=4
%e ..1..1..0..0. .0..0..0..1. .0..1..0..1. .0..0..1..1. .0..1..0..1
%e ..0..0..0..1. .0..1..0..1. .0..0..1..1. .0..1..0..1. .0..0..1..1
%e ..1..1..1..1. .0..1..0..1. .0..1..1..1. .0..0..0..0. .1..0..0..1
%e ..0..0..0..1. .0..1..1..0. .0..0..0..0. .0..1..1..1. .0..1..1..0
%Y Cf. A284771.
%K nonn
%O 1,1
%A _R. H. Hardin_, Apr 02 2017
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