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A068276 1/9 the number of colorings of an n X n rhombic hexagonal array with 9 colors. 1
1, 392, 5765144, 3181273031384, 65865666949993359176, 51166369594150205333793355592, 1491342760953091009621584639091222226600, 1630938910749494351643174313469316936138973479205208 (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..8.

CROSSREFS

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

Sequence in context: A264311 A035751 A107547 * A068288 A085019 A105233

Adjacent sequences:  A068273 A068274 A068275 * A068277 A068278 A068279

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

a(6)-a(8) from Alois P. Heinz, May 02 2012

STATUS

approved

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Last modified August 15 23:32 EDT 2022. Contains 356150 sequences. (Running on oeis4.)