3,2

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

G. Kreweras, Les preordres totaux compatibles avec un ordre partiel. Math. Sci. Humaines No. 53 (1976), 5-30.

Sequence in context: A006469 A081905 A016138 this_sequence A077245 A036732 A027790

Adjacent sequences: A006326 A006327 A006328 this_sequence A006330 A006331 A006332

nonn

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