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 A101453 #2 Feb 27 2009 03:00:00 %S A101453 1,0,4,0,0,192,1792,0,0,466432,0,33658880,441192448 %N A101453 Number of inequivalent solutions to toroidal (8n+1)-queen problem under the symmetry operator R45(x,y)=( (x-y)/sqrt(2), (x+y)/sqrt(2) ). %C A101453 The R45 operator is not valid on toroidal N-queen problem if 2 is not a perfect square modulo N. For example, a(3)=0 is because 2 is not a perfect square modulo 25. see A057126. Toroidal N-queen problem has no fixed points under R45 if N is not equal to 8k+1 for some integer k. %D A101453 Jieh Hsiang, Yuh-Pyng Shieh and YaoChiang Chen, "The Cyclic Complete Mappings Counting Problems", PaPS: Problems and Problem Sets for ATP Workshop in conjunction with CADE-18 and FLoC 2002, Copenhagen, Denmark, 2002/07/27-08/01. %H A101453 Yuh-Pyng Shieh, <a href="http://turing.csie.ntu.edu.tw/~arping/cm">Complete Mappings </a> %e A101453 a(5)=6 because the number of inequivalent solutions to toroidal 41-queen problem under R45 is 192. %Y A101453 Cf. A007705, A057126. %K A101453 hard,nonn %O A101453 0,3 %A A101453 Yuh-Pyng Shieh, Yung-Luen Lan, Jieh Hsiang (arping(AT)turing.csie.ntu.edu.tw), Jan 19 2005