The On-Line Encyclopedia of Integer Sequences (OEIS)

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A121156

Number of monocyclic skeletons with n carbon atoms and a ring size of 9.
(history; published version)

#6 by Alois P. Heinz at Thu May 24 18:10:08 EDT 2018

STATUS

proposed

approved

#5 by Andrew Howroyd at Thu May 24 17:51:27 EDT 2018

STATUS

editing

proposed

#4 by Andrew Howroyd at Thu May 24 17:49:38 EDT 2018

CROSSREFS

Column k=9 of A305059.

#3 by Andrew Howroyd at Thu May 24 15:44:41 EDT 2018

DATA

1, 1, 6, 18, 73, 240, 841, 2714, 8758, 27259, 83847, 252929, 754737, 2225129, 6505344, 18867696, 54384446, 155892016, 444839696, 1264336132, 3581584336, 10116577962, 28505061687, 80146304124, 224929999040, 630259883854, 1763574118096, 4928881367449

LINKS

Andrew Howroyd, <a href="/A121156/b121156.txt">Table of n, a(n) for n = 9..200</a>

EXTENSIONS

Terms a(26) and beyond from Andrew Howroyd, May 24 2018

STATUS

approved

editing

#2 by Russ Cox at Fri Mar 30 17:25:49 EDT 2012

AUTHOR

_Parthasarathy Nambi (PachaNambi(AT)yahoo.com), _, Aug 13 2006

Discussion

Fri Mar 30

17:25

OEIS Server: https://oeis.org/edit/global/136

#1 by N. J. A. Sloane at Fri Sep 29 03:00:00 EDT 2006

NAME

Number of monocyclic skeletons with n carbon atoms and a ring size of 9.

DATA

1, 1, 6, 18, 73, 240, 841, 2714, 8758, 27259, 83847, 252929, 754737, 2225129, 6505344, 18867696, 54384446

OFFSET

9,3

REFERENCES

Camden A. Parks and James B. Hendrickson, Enumeration of monocyclic and bicyclic carbon skeletons, J. Chem. Inf. Comput. Sci., vol. 31, 334-339 (1991).

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 13 2006

STATUS

approved