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A068273 1/6 the number of colorings of an n X n rhombic hexagonal array with 6 colors. 1
1, 80, 65600, 552093440, 47694893373440, 42294602754348892160, 384991688574716612134952960, 35972520655083241381477879725916160, 34501934082562716587411029908821592862883840, 339679276508747763623945195020701159657032777565470720 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 29 01:42 EST 2020. Contains 331328 sequences. (Running on oeis4.)