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Number of (n+1)X7 0..3 arrays with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in row major order
1

%I #5 Mar 31 2012 12:37:33

%S 458859,339846892,249456180709,183306323524536,134683271058638241,

%T 98959148496365005996,72710583381311090972861,

%U 53424368732582002941262016,39253750830669705568949431433,28841837470471858779516861346228

%N Number of (n+1)X7 0..3 arrays with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in row major order

%C Column 6 of A210404

%H R. H. Hardin, <a href="/A210402/b210402.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 21 2012