A000627 Number of non-stereoisomeric paraffins with n carbon atoms. (Formerly M0674 N0249)

1, 1, 1, 2, 3, 5, 7, 13, 20, 35, 55, 96, 156, 267, 438, 747, 1239, 2099, 3498, 5912, 9890, 16677, 27951, 47084, 79019, 133003, 223373, 375824, 631477, 1062160, 1785159, 3002227, 5046641, 8486453, 14266795, 23989770, 40332184, 67816640, 114018876, 191713441, 322330987, 541966582

Offset

1,4

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=1..42.

C. M. Blair and H. R. Henze, The number of stereoisomeric and non-stereoisomeric paraffin hydrocarbons, J. Amer. Chem. Soc., 54 (4) (1932), 1538-1545.

C. M. Blair and H. R. Henze, The number of stereoisomeric and non-stereoisomeric paraffin hydrocarbons, J. Amer. Chem. Soc., 54 (4) (1932), 1538-1545. (Annotated scanned copy)

Formula

Reference gives recurrence.

Crossrefs

Cf. A000626, A000628.

Sequence in context: A249309 A250253 A119717 * A337270 A209237 A322475

Adjacent sequences: A000624 A000625 A000626 * A000628 A000629 A000630

Keyword

nonn,changed

Author

N. J. A. Sloane

Extensions

Corrected and extended by Tom Zeller (tzellera(AT)aim.com), Jun 01 2006

Status

approved