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%I #5 Mar 31 2012 12:35:55
%S 7688,180236,4470575,124987628,3536846184,104681141079,3111047359429,
%T 94229825477592,2858043537687204,87400399190756306,
%U 2673926034812946620,82100619536962270903,2521153331497012720738,77542693730339312318157
%N Half the number of (n+1)X4 0..3 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one
%C Column 3 of A183976
%H R. H. Hardin, <a href="/A183974/b183974.txt">Table of n, a(n) for n = 1..51</a>
%e Some solutions for 3X4
%e ..1..1..1..3....1..3..0..1....1..2..0..2....1..1..3..2....1..1..0..3
%e ..2..2..1..1....1..0..1..1....0..1..0..2....3..1..1..0....0..3..1..0
%e ..2..0..2..2....1..2..0..2....3..0..2..0....1..1..2..2....3..0..2..2
%e ...
%e ...6..5..6.......5..4..3.......4..3..4.......6..6..6.......5..5..4...
%e ...6..5..6.......4..3..4.......4..3..4.......6..5..5.......6..6..5...
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 08 2011
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