4,3

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

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

H. R. Henze and C. M. Blair, The number of structural isomers of the more important types of aliphatic compounds, J. Amer. Chem. Soc., 56 (1934), 157.

Is this the same sequence as A036669?

Sequence in context: A036884 A102291 A034691 this_sequence A036669 A091621 A129921

Adjacent sequences: A000630 A000631 A000632 this_sequence A000634 A000635 A000636

nonn,more

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