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 A201510 #11 Apr 11 2024 14:02:26 %S A201510 0,0,0,0,2578,1247116,97284860,2817340064,44218721793,457851259868, %T A201510 3506596268191,21355746900992,108582220087480,477032549147428, %U A201510 1857084405493128,6529640029479296,21044674478336823,62903854631232636,176034055470126073,464793685059669728 %N A201510 Number of ways to place 9 nonattacking wazirs on an n X n board. %C A201510 Wazir is a leaper [0,1]. %H A201510 V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a> %F A201510 Explicit formula: n^18/362880 - n^16/2016 + n^15/2520 + 349*n^14/8640 - 23*n^13/360 - 277*n^12/144 + 163*n^11/36 + 199529*n^10/3456 - 4381*n^9/24 - 313811*n^8/288 + 1622087*n^7/360 + 1073654363*n^6/90720 - 12207881*n^5/180 - 24979477*n^4/504 + 72278641*n^3/126 - 11491519*n^2/45 - 6271604*n/3 + 2530368, n>=8. %F A201510 G.f.: x^5*(14*x^21 - 226*x^20 + 2514*x^19 - 15414*x^18 + 54363*x^17 - 241813*x^16 + 1440666*x^15 - 4412622*x^14 - 2699713*x^13 + 64333547*x^12 - 202456488*x^11 + 209746960*x^10 + 407620979*x^9 - 1743413585*x^8 + 2469587594*x^7 - 1465834094*x^6 - 9995512037*x^5 - 6126508561*x^4 - 1179686478*x^3 - 74030494*x^2 - 1198134*x - 2578)/(x-1)^19. %F A201510 a(n) = A232833(n,9). - _R. J. Mathar_, Apr 11 2024 %Y A201510 Cf. A172225, A172226, A172227, A172228, A178409, A201507, A201508. %K A201510 nonn %O A201510 1,5 %A A201510 _Vaclav Kotesovec_, Dec 02 2011