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 A057743 #6 Mar 26 2013 02:17:32
%S A057743 1,3,5,7,15,21,35,105,105,210,420,420,840,1260,1540,2520,4620,5460,
%T A057743 9240,15015,16380,30030,60060,60060,120120,180180,180180,360360,
%U A057743 360360,471240,556920,1021020,1141140,2042040,3063060,3423420,6126120,6846840
%N A057743 Maximal order of element of alternating group A_{2n+1}.
%Y A057743 Bisection of A051593. Cf. A057742.
%K A057743 nonn,easy
%O A057743 0,2
%A A057743 _N. J. A. Sloane_, Oct 29 2000
%E A057743 More terms from _Sean A. Irvine_, Mar 25 2013