A055936 Stereoisomeric homologs with molecular formula C_{3+n} H_{6+2n}.

1, 1, 5, 11, 33, 87, 259, 730, 2150, 6278, 18622, 55340, 165857, 498907, 1509012, 4581570, 13967031, 42722777, 131110259, 403527667, 1245358416, 3852965298, 11948207174, 37131355170, 115623660978, 360712069084, 1127276560366

Offset

0,3

References

G. Polya and R. C. Read, Combinatorial Enumeration of Groups, Graphs and Chemical Compounds, Springer-Verlag, 1987, pp. 63-64.

Links

Table of n, a(n) for n=0..26.

G. Polya, Kombinatorische Anzahlbestimmungen für Gruppen, Graphen und chemische Verbindungen, Acta Math. 68 (1937), 145-254.

Formula

G.f.: A(x) = (B(x)^6 + 3*B(x^2)^3 + 2*B(x^3)^2)/6, where B(x) is g.f. for A000625.

Crossrefs

Cf. A000625, A063832.

Sequence in context: A280540 A077917 A127864 * A194589 A189918 A318415

Adjacent sequences: A055933 A055934 A055935 * A055937 A055938 A055939

Keyword

nonn

Author

Vladeta Jovovic, Aug 21 2001

Status

approved