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 A201242 #10 Sep 12 2015 11:00:27 %S A201242 0,0,0,2,1550,546516,28482279,585632520,6829066665,54504255500, %T A201242 331490619174,1642426038486,6930083422496,25686190415144, %U A201242 85541928717375,260349711114720,733731834393719,1934755847570808,4813391235753128,11375736647373750,25684539545337246 %N A201242 Number of ways to place 8 non-attacking wazirs on an n X n toroidal board. %C A201242 Wazir is a leaper [0,1]. %H A201242 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, p.402 %F A201242 a(n) = n^2*(n^14 - 140n^12 + 8722n^10 - 313880n^8 + 7061089n^6 - 99573740n^4 + 817978188n^2 - 3033601200)/40320, n>=9. %F A201242 G.f.: x^4 * (16x^21 - 566x^20 + 8182x^19 - 67700x^18 + 377824x^17 - 1531112x^16 + 4601788x^15 - 10205035x^14 + 16637339x^13 - 21628151x^12 + 32135719x^11 - 68863352x^10 + 138461546x^9 - 189569712x^8 + 133644570x^7 + 20663373x^6 - 378949513x^5 - 174710713x^4 - 19400947x^3 - 520438x^2 - 1516x - 2)/(x-1)^17. %Y A201242 Cf. A201236, A201237, A201238, A201239, A201240, A201241. %K A201242 nonn %O A201242 1,4 %A A201242 _Vaclav Kotesovec_, Nov 28 2011