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 A259264 #18 Jan 17 2018 17:13:29
%S A259264 5,5,31,1555,346201,209102521,269112327121,645369332030641,
%T A259264 2642973843312270721,17340169097630273489281,
%U A259264 173401260912466521665068801,2538767225004530212838194156801,52643875968757162157863810977561601
%N A259264 Cyclotomic polynomial value Phi(5,n!).
%H A259264 Robert Price, <a href="/A259264/b259264.txt">Table of n, a(n) for n = 0..49</a>
%H A259264 OEIS Wiki, <a href="https://oeis.org/wiki/Cyclotomic Polynomials at x=sigma(n)">Cyclotomic Polynomials at x=sigma(n)</a>
%F A259264 a(n) = A053699(n!). - _Michel Marcus_, Jun 23 2015
%t A259264 Table[Cyclotomic[5, n!], {n, 0, 200}]
%o A259264 (PARI) vector(15, n, n--; polcyclo(5, n!)) \\ _Michel Marcus_, Jun 23 2015
%Y A259264 Cf. A053699, A200906.
%K A259264 nonn
%O A259264 0,1
%A A259264 _Robert Price_, Jun 22 2015