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A153469
1/6 of the number of 6-colorings of a planar n X n X n triangular grid.
1
1, 20, 1280, 262400, 172336640, 362631649280, 2444725581455360, 52804515715254149120, 3654168284344820145766400, 810181920328696211112009728000, 575510260400583306243122436913233920
OFFSET
1,2
CROSSREFS
6th row of A182797/6.
Sequence in context: A001451 A093598 A174581 * A160253 A338961 A274645
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 27 2008
EXTENSIONS
a(10)-a(11) from Alois P. Heinz, Dec 03 2010
STATUS
approved