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 A305475 #9 Jun 02 2018 13:06:48
%S A305475 0,-1728,3375,-8000,32768,-54000,-121287375,-287496,884736,-681472000,
%T A305475 12771880859375,14670139392,12288000,-16581375,1566028350940383,
%U A305475 12167000000,-134217728000,-1790957481984,20919104368024767633,9103145472000,884736000
%N A305475 Constant of Hilbert class polynomial H_D(x) as D runs through the numbers -3, -4, -7, -8, -11, -12, ... .
%H A305475 Seiichi Manyama, <a href="/A305475/b305475.txt">Table of n, a(n) for n = 1..1000</a>
%o A305475 (PARI) {a(n) = polcoeff(polclass(-2*n-n%2), 0)}
%Y A305475 Cf. A014601, A032354, A305474.
%K A305475 sign
%O A305475 1,2
%A A305475 _Seiichi Manyama_, Jun 02 2018