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Number of (n+1)X2 0..5 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements
1

%I #5 Mar 31 2012 12:37:00

%S 396,4356,47916,527076,5797836,63776196,701538156,7716919716,

%T 84886116876,933747285636,10271220141996,112983421561956,

%U 1242817637181516,13670994008996676,150380934098963436,1654190275088597796

%N Number of (n+1)X2 0..5 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

%C Column 1 of A203934

%H R. H. Hardin, <a href="/A203927/b203927.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 36*11^n

%e Some solutions for n=4

%e ..1..1....3..0....0..4....2..4....1..1....0..5....3..5....5..4....5..4....5..4

%e ..3..1....5..3....5..0....3..2....5..1....5..0....3..3....5..5....3..5....0..5

%e ..5..3....5..5....4..5....4..3....0..5....0..4....5..3....4..5....1..3....4..0

%e ..3..5....1..5....5..3....1..4....5..2....3..0....4..5....0..4....1..1....5..4

%e ..0..3....3..1....3..4....5..1....2..1....4..3....0..4....5..0....4..1....1..5

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 08 2012