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A246752
Expansion of phi(-x) * chi(x) * psi(-x^3) in powers of x where phi(), psi(), chi() are Ramanujan theta functions.
3
1, -1, -2, 0, 2, 3, -2, 0, 1, -2, -2, 0, 2, 0, -2, 0, 3, -2, 0, 0, 2, 3, -2, 0, 2, -2, -2, 0, 0, 0, -4, 0, 2, -1, -2, 0, 2, 6, 0, 0, 1, -2, -2, 0, 4, 0, -2, 0, 0, -2, -2, 0, 2, 0, -2, 0, 3, -2, -2, 0, 2, 0, 0, 0, 2, -3, -2, 0, 0, 6, -2, 0, 4, 0, -2, 0, 2, 0
OFFSET
0,3
COMMENTS
Ramanujan theta functions: f(q) (see A121373), phi(q) (A000122), psi(q) (A010054), chi(q) (A000700).
LINKS
Eric Weisstein's World of Mathematics, Ramanujan Theta Functions
FORMULA
Expansion of phi(-x) * f(x^1, x^5) in powers of x where phi(), f() are Ramanujan theta functions.
Expansion of q^(-1/3) * eta(q) * eta(q^2) * eta(q^3) * eta(q^12) / (eta(q^4) * eta(q^6)) in powers of q.
G.f. is a period 1 Fourier series which satisfies f(-1 / (144 t)) = 768^(1/2) (t/i) g(t) where q = exp(2 Pi i t) and g() is the g.f. for A246838.
a(n) = (-1)^n * A246650(n).
Convolution of A002448 and A089801.
a(2*n) = A129451(n). a(4*n) = A123884(n). a(4*n + 1) = - A122861(n). a(4*n + 2) = - 2 * A121361(n). a(4*n + 3) = 0.
EXAMPLE
G.f. = 1 - x - 2*x^2 + 2*x^4 + 3*x^5 - 2*x^6 + x^8 - 2*x^9 - 2*x^10 + ...
G.f. = q - q^4 - 2*q^7 + 2*q^13 + 3*q^16 - 2*q^19 + q^25 - 2*q^28 + ...
MATHEMATICA
a[ n_] := SeriesCoefficient[ QPochhammer[ x] QPochhammer[ x^2] QPochhammer[ x^3] QPochhammer[ x^12] / (QPochhammer[ x^4] QPochhammer[ x^6]), {x, 0, n}];
a[ n_] := SeriesCoefficient[ EllipticTheta[ 4, 0, x] QPochhammer[ -x, x^6] QPochhammer[ -x^5, x^6] QPochhammer[ x^6], {x, 0, n}];
PROG
(PARI) {a(n) = my(A); if( n<0, 0, A = x * O(x^n); polcoeff( eta(x + A) * eta(x^2 + A) * eta(x^3 + A) * eta(x^12 + A) / (eta(x^4 + A) * eta(x^6 + A)), n))};
KEYWORD
sign
AUTHOR
Michael Somos, Sep 02 2014
STATUS
approved