The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A289981 Coefficients in expansion of 236364091*E_24/Delta^2 where Delta is the generating function of Ramanujan's tau function (A000594). 2
 236364091, 11345607408, 1388559260664, 12394474658060992, 9814693119921673116, 2019857252618388683232, 190025763555531360708608, 10672023198070702208400000, 413360977196056231738283958, 12054048247468605179718429968 (list; graph; refs; listen; history; text; internal format)
 OFFSET -2,1 LINKS Seiichi Manyama, Table of n, a(n) for n = -2..1000 FORMULA a(n) = 236364091*A028515(n+2) - 340364160000*A000521(n), for n > 0. G.f.: 236364091*j^2 - 340364160000*j + 30710845440000 where j is the elliptic modular invariant. G.f.: (236364091 + 131040 * Sum_{n>=1} sigma_23(n)q^n)/(q^2 * Product_{n>=1} (1 - q^n)^48) where sigma_23(n) is A013971. a(n) ~ 236364091 * exp(4*Pi*sqrt(2*n)) / (2^(1/4) * n^(3/4)). - Vaclav Kotesovec, Apr 09 2018 CROSSREFS Cf. A000521 (j), A000594 (Delta), A013971, A028515 ((q*j)^2), A029831 (236364091*E_24). Cf. A288837. Sequence in context: A328374 A322061 A029831 * A203885 A335591 A234058 Adjacent sequences:  A289978 A289979 A289980 * A289982 A289983 A289984 KEYWORD nonn AUTHOR Seiichi Manyama, Jul 17 2017 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.

Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)