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Number of (n+1)X(2+1) 0..3 arrays with the maximum of every 2X2 subblock equal
1

%I #4 Feb 01 2014 16:06:43

%S 2796,112888,4301002,178006252,7270497452,302691231316,12569519212796,

%T 524245234532960,21854738428787466,911985738401725660,

%U 38053568649173120756,1588184219431937362884,66282825930461723853260

%N Number of (n+1)X(2+1) 0..3 arrays with the maximum of every 2X2 subblock equal

%C Column 2 of A236949

%H R. H. Hardin, <a href="/A236943/b236943.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 50*a(n-1) +99*a(n-2) -21884*a(n-3) +120364*a(n-4) +1009876*a(n-5) -7817815*a(n-6) +7902410*a(n-7) +19309801*a(n-8) -28628820*a(n-9) +8125920*a(n-10)

%e Some solutions for n=2

%e ..0..2..3....0..2..1....1..3..1....1..1..2....2..0..0....1..3..3....1..0..3

%e ..3..3..1....1..3..0....0..3..0....0..3..1....3..3..1....1..2..3....2..3..3

%e ..2..1..2....0..1..0....0..3..2....3..2..1....0..0..2....2..3..0....3..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 01 2014