1,2

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).

D. A. Klarner, The number of graded partially ordered sets, J. Combin. Theory, 6 (1969), 12-19.

Index entries for sequences related to posets

Cf. A001831 (how does that sequence differ?).

Sequence in context: A135749 A005647 A158876 this_sequence A001035 A166380 A136652

Adjacent sequences: A001830 A001831 A001832 this_sequence A001834 A001835 A001836

nonn

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