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A068294 1/5 the number of colorings of an n X n octagonal array with 5 colors. 1
1, 24, 1344, 187008, 65012352, 56638464768, 123968096842368, 682463815024774272, 9455897825697924931968, 329835949030491781985964672, 28967729014957963606903092579840, 6405563550899359667890368716213003520, 3566277295414164369700428069692324488565760, 4998812913455162820842387241261713638306330756608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209.

Sequence in context: A188807 A187029 A186967 * A003170 A160310 A269271

Adjacent sequences:  A068291 A068292 A068293 * A068295 A068296 A068297

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

a(8) from Alois P. Heinz, May 03 2012

a(9)-a(14) from Andrew Howroyd, Jun 25 2017

STATUS

approved

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Last modified October 2 22:14 EDT 2022. Contains 357230 sequences. (Running on oeis4.)