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%I #6 Apr 05 2020 22:47:27
%S 4,19,70,499,3214,22729,163708,1209005,9018250,67956917,515031078,
%T 3926103884,30049105764,230871573750,1779036977175,13746097605518,
%U 106448904000193,826010061981163,6420762665883318,49989175241774203
%N Number of 3 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
%C Row 3 of A284222.
%H R. H. Hardin, <a href="/A284224/b284224.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..0..1. .0..0..1..1. .0..0..0..1. .0..1..1..0. .0..0..0..1
%e ..0..0..1..1. .0..0..0..1. .0..1..1..1. .0..1..1..0. .1..0..1..1
%e ..1..0..0..1. .0..0..0..1. .1..1..1..1. .0..1..0..1. .0..0..1..1
%Y Cf. A284222.
%K nonn
%O 1,1
%A _R. H. Hardin_, Mar 23 2017
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