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 A060817 #14 Jul 04 2016 06:22:25 %S A060817 1,1,2,24,120,1440,5040,40320,362880,3628800,39916800,479001600, %T A060817 6227020800,87178291200,1307674368000,20922789888000,355687428096000, %U A060817 6402373705728000,121645100408832000,2432902008176640000 %N A060817 Size of the automorphism group of the alternating group A_n. %C A060817 For all n except n=2, n=3 and n=6, Aut(A_n) is S_n, i.e., a(n) = n!, while Aut(A_2) = S_1, Aut(A_3) = Aut(C_3) = C_2 = S_2 and Aut(A_6) contains S_6 as a subgroup of index 2. %Y A060817 Cf. A001710, A060249. %K A060817 nonn %O A060817 1,3 %A A060817 Ola Veshta (olaveshta(AT)my-deja.com), Apr 29 2001