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 A198803 #18 Feb 06 2024 08:10:38
%S A198803 1,355687428096000,2252447502438386084347676160000000,
%T A198803 91637618063484032681381970173925718228992000000000000,
%U A198803 8528384964488882787308232082310780143738202829970606470279000000000000000
%N A198803 Number of closed paths of length 17n whose steps are 17th roots of unity.
%C A198803 Equivalently, the number of paths of length 17n in Z^17 from {0}^17 to {n}^17. - _Andrew Howroyd_, Nov 01 2018
%H A198803 Andrew Howroyd, <a href="/A198803/b198803.txt">Table of n, a(n) for n = 0..40</a>
%H A198803 Gilbert Labelle and Annie Lacasse, <a href="https://doi.org/10.46298/dmtcs.2937">Closed paths whose steps are roots of unity</a>, in FPSAC 2011, Reykjavik, Iceland DMTCS proc. AO, 2011, 599-610.
%F A198803 a(n) = (17*n)!/(n!)^17. - _Andrew Howroyd_, Nov 01 2018
%o A198803 (PARI) a(n) = (17*n)!/(n!)^17; \\ _Andrew Howroyd_, Nov 01 2018
%Y A198803 Row n=17 of A187783, column k=17 of A089759.
%K A198803 nonn
%O A198803 0,2
%A A198803 _Simon Plouffe_, Oct 30 2011
%E A198803 Sequence redefined and a(2)-a(4) from _Andrew Howroyd_, Nov 01 2018