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A000633 Ammonium compounds with n carbon atoms.
(Formerly M2667 N1065)
1
1, 1, 3, 7, 18, 42, 109 (list; graph; refs; listen; history; internal format)
OFFSET

4,3

COMMENTS

First page of Henze paper gives a(15)=11733, a(20)=1451178, both in agreement with A036669.

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

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.

CROSSREFS

Is this the same sequence as A036669?

Sequence in context: A036884 A102291 A034691 * A036669 A091621 A129921

Adjacent sequences:  A000630 A000631 A000632 * A000634 A000635 A000636

KEYWORD

nonn,more

AUTHOR

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

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.