1,2

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

G. Kreweras, Complexite et circuits Euleriens dans la sommes tensorielles de graphes, J. Combin. Theory, B 24 (1978), 202-212.

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Sequence in context: A010840 A022073 A010956 this_sequence A126928 A035715 A035609

Adjacent sequences: A006237 A006238 A006239 this_sequence A006241 A006242 A006243

nonn

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