1,3

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

S. Pilpel, Descending subsequences of random permutations, J. Combin. Theory, A 53 (1990), 96-116.

Sequence in context: A028417 A060311 A099237 this_sequence A020026 A077002 A003704

Adjacent sequences: A006217 A006218 A006219 this_sequence A006221 A006222 A006223

nonn

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