This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A289833 #19 Jan 11 2025 03:09:21 %S A289833 24,-504,4416,-19320,30240,100464,-591360,909144,1043280,-5346120, %T A289833 4080384,6932856,-5224128,-17040240,-14807040,110494944,-46366344, %U A289833 -191905560,135085440,84389760,269444448,-410151984,-489646080,611981400,-346642800,1905256080 %N A289833 Fourier coefficients of -q*(Delta/q)' where Delta is the normalized unique weight-twelve cusp form for the full modular group (the generating function of Ramanujan's tau function). %H A289833 Seiichi Manyama, <a href="/A289833/b289833.txt">Table of n, a(n) for n = 1..10000</a> %F A289833 a(n) = -n*A000594(n+1). %e A289833 G.f.: 24*q - 504*q^2 + 4416*q^3 - 19320*q^4 + 30240*q^5 + 100464*q^6 - 591360*q^7 + ... %t A289833 a[n_] := -n * RamanujanTau[n+1]; Array[a, 26] (* _Amiram Eldar_, Jan 11 2025 *) %o A289833 (PARI) a(n) = -n * ramanujantau(n+1); \\ _Amiram Eldar_, Jan 11 2025 %Y A289833 Cf. A000594, A006352 (E_2), A147843. %K A289833 sign %O A289833 1,1 %A A289833 _Seiichi Manyama_, Jul 13 2017