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A068247
1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors.
2
1, 123273728, 606966551329230, 42294602754348892160, 221621345837018832499375, 227499859288036192921814016, 76749554391225308000690033388, 11559255542512176814494743592960, 945121787128699657370828476884045, 47886238054762718784097603771840000
OFFSET
3,2
LINKS
Alois P. Heinz, Formula for A068247
FORMULA
a(n) = A212163(n,6)/6. - Alois P. Heinz, Dec 20 2012
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2002
EXTENSIONS
Extended beyond a(7) by Alois P. Heinz, May 02 2012
STATUS
approved