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A141630
Number of constitutional isomers of alkylcyclobutadienes.
0
1, 1, 3, 5, 13, 26, 66, 152, 366, 907, 2225, 6864
OFFSET
4,3
REFERENCES
Ching-Wan Lam, "Enumeration of isomers of alkylcyclobutadienes by means of alkyl 1,1,1-triradicals", J. Math. Chem., vol. 31 (2002), pp. 333 - 337. See Table 1 on page 336.
EXAMPLE
If n=15 then the number of constitutional isomers of alkylcyclobutadienes is 6864.
CROSSREFS
Sequence in context: A103792 A076156 A339984 * A289467 A289533 A288827
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Aug 28 2008
STATUS
approved