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 A134643 #2 Mar 31 2012 10:22:05
%S A134643 1,5,7,11,15,19,21,27,39,45,57,75,99,135,141,147,177,201,225,1865,
%T A134643 1895,1905,1935,2045,2105,2255,2265,2285,2355,2475,2535,2945,2975,
%U A134643 2985,3015,3305,3395,3415,3445,3515,3525,3575,3595,3645,3655,3735,3805,3825,3835
%N A134643 Odd permutational numbers A134640.
%t A134643 a = {}; b = {}; Do[AppendTo[b, n]; w =Permutations[b]; Do[j = FromDigits[w[[m]], n + 1]; If[OddQ[j],AppendTo[a, j]], {m, 1, Length[w]}], {n, 0, 10}]; a (*Artur Jasinski*)
%Y A134643 Cf. A134640, A134641, A134642, A134644.
%K A134643 nonn
%O A134643 1,2
%A A134643 _Artur Jasinski_, Nov 05 2007