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A068296
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1/7 the number of colorings of an n X n octagonal array with 7 colors.
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1
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1, 120, 161280, 2451486720, 421421199390720, 819296954885530030080, 18013654371239090908333148160, 4479149596637688119857975807616194560, 12595676735919821000208123310178819903753287680, 400570738126155220679966449710339235598075113573822617600
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..10.
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CROSSREFS
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Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209.
Sequence in context: A077692 A322917 A184127 * A123380 A172805 A008701
Adjacent sequences: A068293 A068294 A068295 * A068297 A068298 A068299
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Feb 24 2002
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EXTENSIONS
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a(6)-a(8) from Alois P. Heinz, May 04 2012
a(9)-a(10) from Andrew Howroyd, Jun 25 2017
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STATUS
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approved
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