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 A071886 #5 Nov 04 2013 12:21:57 %S A071886 41,88,85,273,456,370,897,418,943,561,1240,2457,13860,47652,208380, %T A071886 234724,1687203,8509066,67089945,13299944,72454532,940541150, %U A071886 820208766,5192523560,13313765208,46414871454,6589784048694,93614939731600 %N A071886 Trajectory of 41 under map x -> A002487(x)*A002487(x+1). %Y A071886 Cf. A002487, A071885, A071884, A071887. %K A071886 nonn %O A071886 0,1 %A A071886 _N. J. A. Sloane_ and _J. H. Conway_, Jun 10 2002