A000647 Alkyl naphthalenes C_{n+10} H_{2n+8} with n+10 carbon atoms. (Formerly M2018 N0798)

1, 2, 12, 32, 110, 310, 920, 2558, 7177, 19660, 53864, 146180, 396296, 1070296, 2888662, 7785856, 20982905, 56536762, 152378548, 410825678, 1108224556, 2991244712, 8079252116, 21837144430, 59066580606, 159886668880, 433122375508

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..26.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; line 14 of Table I.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; Table I, line 14. (Annotated scanned copy)

Formula

G.f.: A(x) = (A000598(x)^8 + 3*A000598(x^2)^4)/4.

Crossrefs

Sequence in context: A092345 A212761 A102080 * A358852 A363661 A133577

Adjacent sequences: A000644 A000645 A000646 * A000648 A000649 A000650

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

Additional comments from Bruce Corrigan, Nov 04 2002

Status

approved