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A153468 1/5 of the number of 5-colorings of a planar n X n X n triangular grid. 1
1, 12, 324, 19764, 2727756, 852196788, 602756140068, 965229960414132, 3499562183624643780, 28727144381588600187612, 533909545388896809071238444, 22466716989986988610061264294004, 2140465899840618529308907998923768676 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

5th row of A182797/5.

Sequence in context: A083431 A239781 A080141 * A230817 A110101 A185247

Adjacent sequences:  A153465 A153466 A153467 * A153469 A153470 A153471

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 27 2008

EXTENSIONS

a(10)-a(11) from Alois P. Heinz, Dec 03 2010

a(12)-a(13) from Alois P. Heinz, Jul 21 2011

STATUS

approved

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Last modified December 8 04:27 EST 2016. Contains 278902 sequences.