A005304 - OEIS

A005304

Representation degeneracies for Ramond strings.
(Formerly M0336)

2, 2, 4, 10, 18, 32, 58, 98, 164, 274, 442, 704, 1114, 1730, 2660, 4058, 6114, 9136, 13554, 19930

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OFFSET

1,1

REFERENCES

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=1..20.

T. L. Curtright and C. B. Thorn, Symmetry patterns in the mass spectra of dual string models, Nuclear Phys. B 274 (1986), 520-588, Table 6d.

FORMULA

G.f.: 2 * Product (1 - x^k)^(-c(k)); c(k) = 1, 1, 3, 3, 4, 3, 4, 2, 4, 2, 4, 2, ... [Corrected by Sean A. Irvine, Sep 12 2017. But how does this sequence continue?] Answer: See the generating functions given in Section 5 of Curtright-Thorn. - N. J. A. Sloane, Sep 13 2017

CROSSREFS

Sequence in context: A216695 A320069 A002082 * A152732 A308986 A100088

Adjacent sequences: A005301 A005302 A005303 * A005305 A005306 A005307

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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