%I #6 Apr 05 2020 23:29:16
%S 0,30,538,8270,123706,1853532,27938670,424161696,6473516290,
%T 99212813068,1525788269640,23533226594814,363874149524074,
%U 5638501690692214,87539755014915366,1361389260565705844,21203931694258697402
%N Number of n X 4 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.
%C Column 4 of A286979.
%H R. H. Hardin, <a href="/A286975/b286975.txt">Table of n, a(n) for n = 1..174</a>
%e Some solutions for n=4
%e ..0..1..1..1. .0..0..1..0. .1..1..0..0. .1..0..0..0. .0..1..0..1
%e ..0..0..0..1. .1..0..1..0. .0..0..1..0. .1..0..1..0. .0..0..0..1
%e ..1..0..0..1. .1..0..0..0. .1..1..0..1. .0..1..0..1. .1..0..0..0
%e ..0..0..1..1. .1..1..1..0. .0..0..0..0. .1..0..0..0. .0..1..1..1
%Y Cf. A286979.
%K nonn
%O 1,2
%A _R. H. Hardin_, May 17 2017