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%I #4 Jan 30 2014 07:25:48
%S 267,1411,7377,46377,300555,2045011,14169625,99629489,705755971,
%T 5023764027,35858364929,256373385609,1834737940219,13137840357827,
%U 94106513217961,674219636431201,4830962111410931,34617492449991691
%N Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal
%C Column 2 of A236746
%H R. H. Hardin, <a href="/A236740/b236740.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 17*a(n-1) -78*a(n-2) -142*a(n-3) +1902*a(n-4) -2258*a(n-5) -14868*a(n-6) +37484*a(n-7) +39431*a(n-8) -204023*a(n-9) +60026*a(n-10) +473554*a(n-11) -502900*a(n-12) -310088*a(n-13) +766120*a(n-14) -297584*a(n-15) -171072*a(n-16) +157120*a(n-17) -32640*a(n-18)
%e Some solutions for n=4
%e ..1..1..0....1..1..0....1..1..2....0..1..2....2..0..1....1..0..2....2..1..0
%e ..1..2..1....1..1..1....1..1..1....2..1..0....0..0..0....0..1..0....1..1..2
%e ..0..1..1....1..1..2....0..1..1....1..1..1....2..0..0....0..2..0....1..1..0
%e ..1..1..2....2..0..1....1..1..1....1..2..1....0..0..0....0..1..0....1..1..1
%e ..2..1..1....1..1..2....1..2..1....0..1..1....0..0..0....2..0..2....2..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 30 2014
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