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A068272 1/5 the number of colorings of an n X n rhombic hexagonal array with 5 colors. 1
1, 36, 6588, 6169500, 29607951492, 728359861595076, 91850117930957987604, 59375832328440271451653884, 196759041550650648492160100067468, 3342365125469959463321258123750822068332, 291049545090789051667036543236086657649935910108 (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..11.

CROSSREFS

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

Sequence in context: A307351 A268554 A326999 * A068284 A145248 A222974

Adjacent sequences:  A068269 A068270 A068271 * A068273 A068274 A068275

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

a(8)-a(9) from Alois P. Heinz, May 02 2012

a(10)-a(11) from Andrew Howroyd, Jun 25 2017

STATUS

approved

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Last modified December 5 10:45 EST 2019. Contains 329751 sequences. (Running on oeis4.)