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Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 6.
1

%I #8 Aug 11 2014 22:45:56

%S 2440,23568,216592,2442208,25036784,289389648,3057995568,35239626640,

%T 377551693872,4321333099024,46708511630640,531289387089424,

%U 5779703369824304,65409280729909520,715049970687872816

%N Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 6.

%C Column 4 of A233682.

%H R. H. Hardin, <a href="/A233678/b233678.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A233678/a233678.txt">Empirical recurrence of order 45</a>

%F Empirical recurrence of order 45 (see link above).

%e Some solutions for n=2:

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 14 2013