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A068296
1/7 the number of colorings of an n X n octagonal array with 7 colors.
1
1, 120, 161280, 2451486720, 421421199390720, 819296954885530030080, 18013654371239090908333148160, 4479149596637688119857975807616194560, 12595676735919821000208123310178819903753287680, 400570738126155220679966449710339235598075113573822617600
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Feb 24 2002
EXTENSIONS
a(6)-a(8) from
Alois P. Heinz
, May 04 2012
a(9)-a(10) from
Andrew Howroyd
, Jun 25 2017
STATUS
approved
