OFFSET
-1,3
COMMENTS
Also McKay-Thompson series of class 46D for the Monster group.
LINKS
G. C. Greubel, Table of n, a(n) for n = -1..1000
D. Ford, J. McKay and S. P. Norton, More on replicable functions, Commun. Algebra 22, No. 13, 5175-5193 (1994).
FORMULA
Expansion of A + 1 + 2/A, where A = eta(q)*eta(q^23)/(eta(q^2)* eta(q^46)), in powers of q. - G. C. Greubel, Jun 27 2018
a(n) ~ exp(2*Pi*sqrt(2*n/23)) / (2^(3/4) * 23^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jun 28 2018
EXAMPLE
T46C = 1/q +2*q +q^2 +3*q^3 +3*q^4 +5*q^5 +5*q^6 +10*q^7 +...
MATHEMATICA
eta[q_] := q^(1/24)*QPochhammer[q]; A := (eta[q]*eta[q^23]/( eta[q^2]* eta[q^46])); a:= CoefficientList[Series[1 + A + 2/A, {q, 0, 60}], q]; Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jun 27 2018 *)
PROG
(PARI) q='q+O('q^50); A = eta(q)*eta(q^23)/(q*eta(q^2)* eta(q^46)); Vec(A + 1 + 2/A) \\ G. C. Greubel, Jun 27 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 27 2000
STATUS
approved