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 A081263 #21 Feb 16 2025 08:32:48 %S A081263 1,0,0,0,16,0,20190684 %N A081263 Number of distinct (modulo rotation and reflection) n X n associative panmagic squares. %C A081263 It is known that a(10)=0. %C A081263 _Walter Trump_ estimates a(8) ~= 4.677*10^15 and a(9) ~= 1.363*10^24. %D A081263 Gardner, M. "Magic Squares and Cubes." Ch. 17 in Time Travel and Other Mathematical Bewilderments. New York: W.H. Freeman, pp. 213-225, 1988. %H A081263 Walter Trump, <a href="http://www.trump.de/magic-squares/howmany.html">How many magic squares are there? - Results of historical and computer enumeration</a>. %H A081263 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AssociativeMagicSquare.html">Associative Magic Square</a> %H A081263 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %Y A081263 Cf. A006052, A081262. %K A081263 nonn,hard,more %O A081263 1,5 %A A081263 _Eric W. Weisstein_, Mar 14 2003 %E A081263 a(6)-a(7) from _Walter Trump_'s website, added by _Max Alekseyev_, May 22 2008