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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; text; 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

Table of n, a(n) for n=4..10.

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)

CROSSREFS

Is this the same sequence as A036669?

Sequence in context: A034691 A317546 A319001 * A036669 A091621 A129921

Adjacent sequences:  A000630 A000631 A000632 * A000634 A000635 A000636

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified October 22 05:29 EDT 2019. Contains 328315 sequences. (Running on oeis4.)