OFFSET
-1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = -1..1000
J. H. Conway and S. P. Norton, Monstrous Moonshine, Bull. Lond. Math. Soc. 11 (1979) 308-339.
D. Ford, J. McKay and S. P. Norton, More on replicable functions, Commun. Algebra 22, No. 13, 5175-5193 (1994).
J. McKay and H. Strauss, The q-series of monstrous moonshine and the decomposition of the head characters, Comm. Algebra 18 (1990), no. 1, 253-278.
FORMULA
a(n) ~ exp(4*Pi*sqrt(n/5)) / (sqrt(2)*5^(1/4)*n^(3/4)). - Vaclav Kotesovec, Apr 01 2017
Expansion of 10 + F +125/F, where F = (eta(q)/eta(q^5))^6, in powers of q. - G. C. Greubel, Jun 02 2018
MATHEMATICA
nmax = 30; CoefficientList[Series[10*x + 125*x^2*Product[((1 - x^(5*k))/(1 - x^k))^6, {k, 1, nmax}] + Product[((1 - x^k)/(1 - x^(5*k)))^6, {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Apr 01 2017 *)
eta[q_]:= q^(1/24)*QPochhammer[q]; a:= CoefficientList[Series[ q*(10 + (eta[q]/eta[q^5])^6 + 125*(eta[q^5]/eta[q])^6), {q, 0, 60}], q];
Table[a[[n]], {n, 1, 50}] (* G. C. Greubel, Jun 02 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved