1,4

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: A097486 A121515 A002277 this_sequence A075835 A077698 A080488

Adjacent sequences: A001504 A001505 A001506 this_sequence A001508 A001509 A001510

nonn

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