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 A130042 #8 Apr 09 2014 10:14:39 %S A130042 1,4,2,15,9,33,58,3,510,90,45,129,2043,12925,6,227,599,288,13803, %T A130042 25453,75368,429,24,5,118133,255419,106550,694,74,798,1638477,650183, %U A130042 850528,1733925,32,1149,2620617,3173990,151,1417,176,1565,4489633,22622373 %N A130042 A130041(n) is the a(n)-th composite number. %C A130042 This sequence is a permutation of the positive integers. %F A130042 a(n)=A065855(A130041(n)). - _R. J. Mathar_, Oct 15 2007 %Y A130042 Cf. A130041. %K A130042 nonn %O A130042 2,2 %A A130042 _Leroy Quet_, May 02 2007 %E A130042 More terms from _R. J. Mathar_, Oct 15 2007