3,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

P. A. MacMahon, Combinations derived from m identical sets of n different letters and their connexion with general magic squares, Proc. London Math. Soc., 17 (1917), 25-41.

Sequence in context: A071076 A112501 A093345 this_sequence A117226 A117156 A113229

Adjacent sequences: A002133 A002134 A002135 this_sequence A002137 A002138 A002139

nonn

N. J. A. Sloane (njas(AT)research.att.com).