A209733 - OEIS

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

%S 21976,775096,28927984,1138541280,45147495264,1809791149768,

%T 72515584004736,2914488537817408,117033599127615880,

%U 4704742675739474176,189030631236371886792,7598451666243980931808,305353336500744007552616

%N 1/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having distinct edge sums

%C Column 5 of A209736

%H R. H. Hardin, <a href="/A209733/b209733.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2012