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 A083161 #4 Dec 05 2013 19:56:14 %S A083161 1,6,41,308,2465,20542,176075,1540657,13694729,1232525611,11204778282, %T A083161 1027104675851,9480966238625,880375436443751,8216837406808343, %U A083161 77032850688828216,725015065306618504,68473645056736192045 %N A083161 a(n) = (concatenation of the first n terms of A099552)/n. %Y A083161 Cf. A073893. %K A083161 base,nonn %O A083161 1,2 %A A083161 _Amarnath Murthy_, Apr 25 2003 %E A083161 Corrected and extended by _David Wasserman_, Oct 21 2004