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!)
A022687 Expansion of Product_{m>=1} (1-m*q^m)^27. 2
1, -27, 297, -1548, 2079, 18036, -88893, 42471, 632259, -1042392, -2491695, 3171771, 19897479, -6178491, -149788494, 40753548, 598051971, 397032246, -1758684468, -5331986973, 4009289778, 22014953235 (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)^27, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 19 2018 *)

PROG

(PARI) m=50; q='q+O('q^m); Vec(prod(n=1, m, (1-n*q^n)^27)) \\ G. C. Greubel, Jul 19 2018

(MAGMA) Coefficients(&*[(1-m*x^m)^27:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 19 2018

CROSSREFS

Sequence in context: A049011 A115246 A202126 * A083813 A086574 A274832

Adjacent sequences:  A022684 A022685 A022686 * A022688 A022689 A022690

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 10 20:05 EDT 2022. Contains 356039 sequences. (Running on oeis4.)