login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A305443 Expansion of q * f(-q^1, -q^6)^3 / f(-q^2, -q^5)^2 * f(-q^3, -q^4) in powers of q where f() is Ramanujan's two-variable theta function. 3
1, -3, 5, -6, 7, -7, 3, 4, -12, 22, -32, 35, -28, 13, 14, -53, 90, -116, 126, -105, 42, 53, -164, 280, -366, 378, -301, 128, 142, -469, 773, -978, 1015, -805, 322, 374, -1179, 1942, -2450, 2492, -1946, 791, 884, -2809, 4558, -5678, 5754, -4473, 1781, 2004, -6251, 10104 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Ramanujan Theta Functions
MATHEMATICA
nmax = 50; CoefficientList[Series[Product[((1 - x^(7*k - 1)) * (1 - x^(7*k - 6)))^3 / ((1 - x^(7*k - 2))^2 * (1 - x^(7*k - 5))^2 * (1 - x^(7*k - 3)) * (1 - x^(7*k - 4))), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Oct 11 2018 *)
CROSSREFS
Convolution inverse of A108481.
Cf. A262933.
Sequence in context: A082218 A111612 A317920 * A362074 A122818 A070083
KEYWORD
sign
AUTHOR
Seiichi Manyama, Oct 10 2018
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)