0,2

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

Sequence in context: A111531 A052781 A049378 this_sequence A006386 A094655 A015865

Adjacent sequences: A001826 A001827 A001828 this_sequence A001830 A001831 A001832

nonn

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