login
Representation degeneracies for Ramond strings.
(Formerly M0336)
0

%I M0336 #26 Sep 13 2017 10:54:04

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

%T 13554,19930

%N Representation degeneracies for Ramond strings.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H T. L. Curtright and C. B. Thorn, <a href="http://dx.doi.org/10.1016/0550-3213(86)90525-0">Symmetry patterns in the mass spectra of dual string models</a>, Nuclear Phys. B 274 (1986), 520-588, Table 6d.

%F 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

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_.