A068273 1/6 the number of colorings of an n X n rhombic hexagonal array with 6 colors.

1, 80, 65600, 552093440, 47694893373440, 42294602754348892160, 384991688574716612134952960, 35972520655083241381477879725916160, 34501934082562716587411029908821592862883840, 339679276508747763623945195020701159657032777565470720

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..10.

Crossrefs

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

Sequence in context: A187052 A159377 A183582 * A068285 A159408 A159391

Adjacent sequences: A068270 A068271 A068272 * A068274 A068275 A068276

Keyword

nonn

Author

R. H. Hardin, Feb 24 2002

Extensions

a(7)-a(9) from Alois P. Heinz, May 02 2012

a(10) from Andrew Howroyd, Jun 25 2017

Status

approved