1,1

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

V. Chvatal, Edmonds polytopes and a hierarchy of combinatorial problems, Discrete Math. 4 (1973), 305-337.

Sequence in context: A025169 A111282 A115730 this_sequence A027994 A027068 A118041

Adjacent sequences: A003139 A003140 A003141 this_sequence A003143 A003144 A003145

nonn,bref,hard,more

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