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 A095161 #5 Dec 05 2013 19:56:51 %S A095161 1,2,3,2,3,4,3,5,4,5,4,5,4,5,6,5,7,6,7,6,7,6,7,6,7,6,8,7,8,7,8,9,8,9, %T A095161 8,9,8,9,8,9,8,9,10,9,10,9,10,9,10,11,10,11,10,11,10,11,10,11,10,11, %U A095161 10,11,12,11,12,11,12,11 %N A095161 n occurs n times, with distinct successive terms. %C A095161 A different sequence with the same definition is 1, 2, 3, 2, 3, 4, 3, 4, 5, 4, 5, 4, 5, 6, 5, 6, 5, 6, 7, 6, 7, 6, 7, 6, 7, 8, 7, 8, 7, 8, 7, 8, 9, 8, 9, 8, 9, 8, 9, 8, 9, 10, .. This would follow a more regular construction principle, that is, placing low numbers as early as possible: here a(7)=4 instead of a(7)=5 etc. - _R. J. Mathar_, Sep 25 2006 %Y A095161 Cf. A095162. %K A095161 nonn %O A095161 0,2 %A A095161 _Amarnath Murthy_, Jun 01 2004