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%I #6 Mar 31 2012 12:35:55
%S 128,992,7688,64976,549152,4780976,41623688,366310352,3223723808,
%T 28480830608,251621342408,2226098835920,19694339040800,
%U 174322195009040,1542993019964552,13660022569173968,120931341993127712
%N Half the number of (n+1)X2 0..3 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one
%C Column 1 of A183976
%H Ron Hardin, <a href="/A183972/b183972.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=10*a(n-1)-96*a(n-3)+669*a(n-4)-6162*a(n-5)+3936*a(n-6)+20976*a(n-7)-24228*a(n-8)+291240*a(n-9)-94464*a(n-10)-1024704*a(n-11)+385344*a(n-12)-24192*a(n-13)+912384*a(n-15)-331776*a(n-16)
%e Some solutions for 3X2
%e ..0..2....1..1....2..0....2..2....0..1....3..1....3..0....3..3....0..1....1..2
%e ..2..0....0..0....0..2....3..2....2..3....3..1....3..0....1..2....1..2....1..3
%e ..1..2....0..3....1..1....3..2....0..2....3..1....1..2....3..2....0..1....1..1
%e ...
%e ...4.......2.......4.......9.......6.......8.......6.......9.......4.......7...
%e ...5.......3.......4......10.......7.......8.......6.......8.......4.......6...
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 08 2011
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