A209732 - OEIS

%I #5 Mar 31 2012 12:37:30

%S 3912,86744,1995752,47572464,1138541280,27425792944,660346502176,

%T 15926642688032,383927816903616,9260294185296568,223295813816665920,

%U 5385580739872287984,129876262463016021256,3132320639165421379936

%N 1/4 the number of (n+1)X5 0..3 arrays with every 2X2 subblock having distinct edge sums

%C Column 4 of A209736

%H R. H. Hardin, <a href="/A209732/b209732.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2012