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 A305920 #24 Feb 16 2025 08:33:54 %S A305920 0,196560,16773120,-18919981080,-3292295086080,2312547886368720, %T A305920 640457437563740160,-302667453389051314200,-123005476312830648176640, %U A305920 39529719620247267255853008,23306082528463942764630528000,-4849033309391159571741461446680 %N A305920 Inverse Euler transform of A008408. %C A305920 a(n) is a multiple of 24. %H A305920 Seiichi Manyama, <a href="/A305920/b305920.txt">Table of n, a(n) for n = 1..377</a> %H A305920 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A305920 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LeechLattice.html">Leech Lattice</a> %e A305920 1 + 196560*q^2 + 16773120*q^3 + 398034000*q^4 + ... = (1-q^2)^(-196560) * (1-q^3)^(-16773120) * (1-q^4)^18919981080 * ... . %Y A305920 Cf. A008408, A108093. %K A305920 sign %O A305920 1,2 %A A305920 _Seiichi Manyama_, Jun 14 2018