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 A201626 #15 Aug 30 2016 06:25:15 %S A201626 1,2,6,228,6745,252792,11281312,585632520,34690541994,2309813476870, %T A201626 170797663069044,13888215374348892,1231730727253607451, %U A201626 118329596584708240732,12241103359460777972760,1356712722052907806912016 %N A201626 Number of ways to place n nonattacking wazirs on an n X n toroidal board. %C A201626 Wazir is a leaper [0,1]. %H A201626 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, 2013, p. 411. %F A201626 Asymptotics: a(n) ~ n^(2n)/n!*exp(-5/2). %Y A201626 Cf. A027683, A201511. %K A201626 nonn,hard %O A201626 1,2 %A A201626 _Vaclav Kotesovec_, Dec 03 2011