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%I #4 Dec 21 2015 08:22:52
%S 1,39,230,929,6307,52171,371130,2568565,18322421,129531126,926299920,
%T 6712699992,48087248218,341400959047,2440466698929,17538694281014,
%U 125725413376414,899035671334963,6432936252126858,46077832832481217
%N Number of 4Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.
%C Row 4 of A266101.
%H R. H. Hardin, <a href="/A266104/b266104.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..1..0..0..0....1..0..1..1....0..1..2..0....1..0..1..1....0..0..1..1
%e ..0..0..0..0....1..1..0..1....2..1..1..2....0..2..0..1....1..1..0..0
%e ..0..0..0..0....2..1..2..0....0..2..1..1....1..0..2..1....1..0..0..1
%e ..0..0..0..1....1..0..0..0....0..0..0..1....0..0..0..0....1..2..1..0
%Y Cf. A266101.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 21 2015
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