A000646 Number of alkyls Y^{II} C_n H_{2n+2} with n carbon atoms. (Formerly M0800 N0303)

1, 2, 3, 6, 13, 28, 62, 144, 338, 810, 1970, 4852, 12073, 30334, 76805, 195850, 502461, 1296122, 3359527, 8745744, 22856223, 59944156, 157718380, 416189954, 1101204387, 2920914484, 7765357967, 20688204244, 55225188289, 147688302518

Offset

0,2

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=0..29.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 12 of Table I.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; Table I, line 12. (Annotated scanned copy)

Formula

G.f.: A(x) = A000598(x)^2.

Crossrefs

Sequence in context: A032160 A089735 A316694 * A316770 A197463 A032048

Adjacent sequences: A000643 A000644 A000645 * A000647 A000648 A000649

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved