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A068285 1/6 the number of colorings of an n X n staggered hexagonal array with 6 colors. 1
1, 80, 65600, 552093440, 47695073906240, 42295002762341131520, 384997602083152626170331200, 35973286295593063089098993201626880, 34502872879799250159432202960093141227521600 (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..9.

CROSSREFS

Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195.

Sequence in context: A159377 A183582 A068273 * A159408 A159391 A323448

Adjacent sequences:  A068282 A068283 A068284 * A068286 A068287 A068288

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

a(7)-a(9) from Alois P. Heinz, May 03 2012

STATUS

approved

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)