A068280 - OEIS

%I #9 May 02 2012 12:10:51

%S 1,1452,214360212,3217625521859892,4910668309995799841810892,

%T 762007921240709867578673020749884172,

%U 12022427131636998562079732651101772918046821260092,19285841951971298297383495940474744273219471204301574972512789012

%N 1/13 times the number of colorings of an n X n rhombic hexagonal array with 13 colors.

%C Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.

%Y Cf. A068239-A068305, A000332, A002417, A027441, A212162, A212163.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(5)-a(8) from _Alois P. Heinz_, May 02 2012