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A160871
Column 6 of array in A057004.
1
1, 63, 7987, 7987616, 24875000437, 193466859054994
OFFSET
1,2
REFERENCES
J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161.
CROSSREFS
Sequence in context: A069433 A178634 A174763 * A183525 A279043 A234629
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 15 2009
STATUS
approved