The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A022570 Expansion of Product_{m>=1} (1+x^m)^5. 3

%I #29 Sep 08 2022 08:44:46

%S 1,5,15,40,95,206,425,835,1575,2880,5121,8885,15095,25165,41240,66562,

%T 105945,166480,258560,397235,604162,910325,1359680,2014235,2961000,

%U 4321283,6263360,9019555,12908945,18367805,25990149,36581200,51228175,71393555,99037095,136775685,188091960

%N Expansion of Product_{m>=1} (1+x^m)^5.

%H Seiichi Manyama, <a href="/A022570/b022570.txt">Table of n, a(n) for n = 0..1000</a>

%H Vaclav Kotesovec, <a href="http://arxiv.org/abs/1509.08708">A method of finding the asymptotics of q-series based on the convolution of generating functions</a>, arXiv:1509.08708 [math.CO], Sep 30 2015, p. 8.

%F a(n) ~ (5/3)^(1/4) * exp(Pi * sqrt(5*n/3)) / (16 * n^(3/4)). - _Vaclav Kotesovec_, Mar 05 2015

%F a(0) = 1, a(n) = (5/n)*Sum_{k=1..n} A000593(k)*a(n-k) for n > 0. - _Seiichi Manyama_, Apr 03 2017

%F G.f.: exp(5*Sum_{k>=1} (-1)^(k+1)*x^k/(k*(1 - x^k))). - _Ilya Gutkovskiy_, Feb 06 2018

%t nmax=50; CoefficientList[Series[Product[(1+q^m)^5,{m,1,nmax}],{q,0,nmax}],q] (* _Vaclav Kotesovec_, Mar 05 2015 *)

%o (PARI) x='x+O('x^51); Vec(prod(m=1, 50, (1 + x^m)^5)) \\ _Indranil Ghosh_, Apr 03 2017

%o (Magma) Coefficients(&*[(1+x^m)^5:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // _G. C. Greubel_, Feb 26 2018

%Y Cf. A000009.

%Y Column k=5 of A286335.

%K nonn

%O 0,2

%A _N. J. A. Sloane_

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 June 10 00:22 EDT 2024. Contains 373251 sequences. (Running on oeis4.)