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A068278
1/11 the number of colorings of an n X n rhombic hexagonal array with 11 colors.
1
1, 810, 43047450, 150104969072730, 34342194186546625610730, 515520974797472540384088260118570, 507750044609844563320250272016778947097815370, 32812470510724769634930013386228840033573943730279978702970
OFFSET
1,2
COMMENTS
Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2002
EXTENSIONS
a(5)-a(8) from Alois P. Heinz, May 02 2012
STATUS
approved