4,2

P. Lisonek, Closed forms for the number of polygon dissections. Journal of Symbolic Computation 20 (1995), 595-601.

R. C. Read, On general dissections of a polygon, Aequat. Math. 18 (1978), 370-388.

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

Adjacent sequences: A003439 A003440 A003441 this_sequence A003443 A003444 A003445

Sequence in context: A050929 A019005 A112288 this_sequence A054894 A139475 A034568

nonn

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