login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A022712 Expansion of Product_{m>=1} (1+m*q^m)^-20. 2
1, -20, 170, -800, 2415, -6404, 21550, -71080, 178295, -419200, 1203282, -3294360, 7476320, -17381780, 44919500, -107605880, 237628435, -544086720, 1273805460, -2864694880, 6256648862, -13710129840 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

MATHEMATICA

With[{nmax = 50}, CoefficientList[Series[Product[(1 + k*q^k)^-20, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 20 2018 *)

PROG

(PARI) m=50; q='q+O('q^m); Vec(prod(n=1, m, (1+n*q^n)^-20)) \\ G. C. Greubel, Jul 20 2018

CROSSREFS

Sequence in context: A056932 A304508 A010826 * A056128 A027791 A047819

Adjacent sequences:  A022709 A022710 A022711 * A022713 A022714 A022715

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 10:06 EST 2019. Contains 320390 sequences. (Running on oeis4.)