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: A017978 A163610 A055825 this_sequence A058120 A000349 A036919

Adjacent sequences: A006323 A006324 A006325 this_sequence A006327 A006328 A006329

nonn

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