OFFSET
-1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = -1..1500
D. Ford, J. McKay and S. P. Norton, More on replicable functions, Comm. Algebra 22, No. 13, 5175-5193 (1994).
FORMULA
Expansion of A - 2*q/A, where A = q^(1/2)*(eta(q)*eta(q^11)/( eta(q^2)* eta(q^22))), in powers of q. - G. C. Greubel, Jun 27 2018
a(n) ~ -exp(2*Pi*sqrt(n/11)) / (2 * 11^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jun 29 2018
EXAMPLE
T44a = 1/q - 3*q - 2*q^3 - 3*q^5 - 3*q^7 - 5*q^9 - 5*q^11 - 9*q^13 - 8*q^15 - ...
MATHEMATICA
eta[q_] := q^(1/24)*QPochhammer[q]; A:= q^(1/2)*(eta[q]*eta[q^11]/( eta[q^2]*eta[q^22])); a:= CoefficientList[Series[A - 2*q/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^11)/(eta(q^2)*eta(q^22)); Vec(A - 2*q/A) \\ G. C. Greubel, Jun 27 2018
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Nov 27 2000
EXTENSIONS
Terms a(12) onward added by G. C. Greubel, Jun 27 2018
STATUS
approved