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 A057742 #6 Mar 26 2013 02:17:47
%S A057742 1,1,3,5,15,21,35,60,105,140,210,420,420,1155,1365,2310,4620,5460,
%T A057742 9240,13860,16380,27720,32760,60060,60060,120120,180180,180180,360360,
%U A057742 360360,510510,1021020,1141140,2042040,3063060,3423420,6126120,6846840
%N A057742 Maximal order of element of alternating group A_{2n}.
%Y A057742 Bisection of A051593. Cf. A057743.
%K A057742 nonn,easy
%O A057742 0,3
%A A057742 _N. J. A. Sloane_, Oct 29 2000
%E A057742 More terms from _Sean A. Irvine_, Mar 25 2013