A000634 Number of glycols with n carbon atoms. (Formerly M1604 N0627)

1, 2, 6, 14, 38, 97, 260, 688, 1856, 4994, 13550, 36791, 100302, 273824, 749316, 2053247, 5635266, 15484532, 42599485, 117312742, 323373356, 892139389, 2463252315, 6806148956, 18818714543, 52065725034, 144135111504, 399232819042, 1106385615943

Offset

2,2

References

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

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

Links

Table of n, a(n) for n=2..30.

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 (1) (1934), 157-157.

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 (1) (1934), 157-157. (Annotated scanned copy)

R. C. Read, The Enumeration of Acyclic Chemical Compounds, pp. 25-61 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976. [Annotated scanned copy] See p. 28.

Formula

a(n) = A000636(n) - A000642(n). - Sean A. Irvine, Nov 18 2016

Crossrefs

Cf. A000636, A000642.

Sequence in context: A190788 A168259 A275208 * A006654 A127546 A192484

Adjacent sequences: A000631 A000632 A000633 * A000635 A000636 A000637

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Sean A. Irvine, Nov 18 2016

Status

approved