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 A320686 #13 Feb 16 2025 08:33:56 %S A320686 0,756,4032,-265734,-2987712,120604680,2176735680,-58263976134, %T A320686 -1563340453248,27722120100948,1105815958027200,-12029301541618956, %U A320686 -769283790627284352,3952625120472002580,525306588856752370752,41570815360527775098,-351118365555207656907648 %N A320686 Inverse Euler transform of A004010. %C A320686 a(n) is a multiple of 6. %H A320686 Seiichi Manyama, <a href="/A320686/b320686.txt">Table of n, a(n) for n = 1..695</a> %H A320686 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A320686 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Coxeter-ToddLattice.html">Coxeter-Todd Lattice</a> %e A320686 1 + 756*q^2 + 4032*q^3 + 20412*q^4 + ... = (1-q^2)^(-756) * (1-q^3)^(-4032) * (1-q^4)^265734 * ... . %Y A320686 Cf. A004010, A107658. %K A320686 sign %O A320686 1,2 %A A320686 _Seiichi Manyama_, Oct 19 2018