OFFSET
0,3
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.
LINKS
John Cannon, Table of n, a(n) for n = 0..5000
S. Ahlgren, The sixth, eighth, ninth and tenth powers of Ramanujan's theta function, Proc. Amer. Math. Soc., 128 (1999), 1333-1338; F_5(q).
G. Nebe and N. J. A. Sloane, Home page for this lattice
FORMULA
Expansion of f(-x)^5 / f(-x^5) + 5 * x * f(-x^5)^5 / f(-x) in powers of x where f() is a Ramanujan theta function. - Michael Somos, Jan 29 2011
G.f. is a period 1 Fourier series which satisfies f(-1 / (5 t)) = 5^(1/2) (t/i)^2 g(t) where q = exp(2*Pi*i*t) and g() is g.f. for A008444. - Michael Somos, Jan 29 2011
a(5*n) = A008444(n). a(5*n + 1) = a(5*n + 4) = 0. - Michael Somos, Jan 29 2011
EXAMPLE
1 + 10*x^2 + 20*x^3 + 20*x^5 + 60*x^7 + 50*x^8 + 30*x^10 + 60*x^12 + ...
1 + 10*q^4 + 20*q^6 + 20*q^10 + 60*q^14 + 50*q^16 + 30*q^20 + 60*q^24 + 120*q^26 + 60*q^30 + 160*q^34 + 70*q^36 + 60*q^40 + 120*q^44 + 220*q^46 + 120*q^50 + 200*q^54 + 180*q^56 + 40*q^60 + O(q^62).
MATHEMATICA
a[n_] := Module[{A = x*O[x]^n}, SeriesCoefficient[QPochhammer[x+A]^5 / QPochhammer[x^5+A] + 5*x*(QPochhammer[x^5+A]^5 / QPochhammer[x+A]), {x, 0, n}]]; Table[a[n], {n, 0, 80}] (* Jean-François Alcover, Nov 05 2015, adapted from PARI *)
PROG
(Magma) L:=Lattice("A", 4); D:=Dual(L); T1<q> := ThetaSeries(D, 60);
(PARI) {a(n) = local(A); if( n<0, 0, A = x * O(x^n); polcoeff( eta(x + A)^5 / eta(x^5 + A) + 5 * x * eta(x^5 + A)^5 / eta(x + A), n))}; /* Michael Somos, Jan 29 2011 */
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from N. J. A. Sloane, Dec 24 2006
STATUS
approved