%I #4 Dec 18 2013 21:01:10
%S 307,3059,30263,300597,2990333,29784763,296931707,2962134453,
%T 29563955929,295171226895,2947800648335,29444533201105,
%U 294151869831861,2938885998922955,29364742567410699,293422429935714509
%N Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1
%C Column 2 of A234036
%H R. H. Hardin, <a href="/A234030/b234030.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 18*a(n-1) -79*a(n-2) -56*a(n-3) +459*a(n-4) +56*a(n-5) -597*a(n-6) -88*a(n-7) +90*a(n-8) -10*a(n-9)
%e Some solutions for n=3
%e ..2..3..3....1..0..1....3..3..4....2..1..2....3..4..4....3..3..3....3..2..3
%e ..3..3..4....1..1..0....4..3..4....2..2..1....4..3..4....4..3..3....2..3..3
%e ..4..4..4....1..0..1....3..4..4....1..2..2....3..3..4....3..3..2....3..2..3
%e ..3..4..4....0..1..1....4..4..4....2..2..2....4..3..4....4..3..2....2..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 18 2013