OFFSET
-1,5
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 sqrt(T38A), where T38A = A058657, in powers of q. - G. C. Greubel, Jun 24 2018
a(n) ~ exp(2*Pi*sqrt(n/19)) / (2 * 19^(1/4) * n^(3/4)). - Vaclav Kotesovec, Jun 27 2018
EXAMPLE
T76a = 1/q + q^3 + q^5 + 2*q^7 + q^9 + 2*q^11 + q^13 + 3*q^15 + 3*q^17 + ...
MATHEMATICA
nmax = 100; QP := QPochhammer; G[q_] := 1/(QP[q, q^5]*QP[q^4, q^5]); H[q_] := 1/(QP[q^2, q^5]*QP[q^3, q^5]); T19A := -3 + (G[q]*G[q^19] + q^4*H[q]*H[q^19])^3/q; T38A := -1/2 + (17/4 + T19A + (T19A /. {q -> q^2}) + O[q]^nmax)^(1/2); a:= CoefficientList[Series[(q*T38A + O[q]^nmax)^(1/2), {q, 0, 60}], q]; Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jun 24 2018 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 27 2000
EXTENSIONS
Terms a(12) onward added by G. C. Greubel, Jun 24 2018
STATUS
approved