1,5

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).

R. C. Mullin and P. J. Schellenberg, The enumeration of c-nets via triangulations, J. Combin. Theory, 4 (1968), 259-276.

Sequence in context: A053100 A126422 A106738 this_sequence A157946 A034242 A142811

Adjacent sequences: A001505 A001506 A001507 this_sequence A001509 A001510 A001511

nonn

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