1,2

J. H. Kwak and J. Lee, J. Graph Th., 23 (1996), 105-109.

V. A. Liskovets, Reductive enumeration under mutually orthogonal group actions, Acta Applic. Math., 52 (1998), 91-120.

R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.13(c), pp. 76, 112.

J. H. Kwak and J. Lee, Enumeration of graph coverings and surface branched coverings, Lecture Note Series 1 (2001), Com^2MaC-KOSEF, Korea. See chapter 3.

Cf. A057004-A057012.

Sequence in context: A012147 A012011 A139161 this_sequence A055755 A116006 A079826

Adjacent sequences: A057010 A057011 A057012 this_sequence A057014 A057015 A057016

nonn

njas, Sep 09 2000

More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 25 2001