A068280 1/13 times the number of colorings of an n X n rhombic hexagonal array with 13 colors.

1, 1452, 214360212, 3217625521859892, 4910668309995799841810892, 762007921240709867578673020749884172, 12022427131636998562079732651101772918046821260092, 19285841951971298297383495940474744273219471204301574972512789012

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Comments

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

Crossrefs

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

Extensions

a(5)-a(8) from Alois P. Heinz, May 02 2012