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 A081956 #16 Aug 25 2014 13:51:21 %S A081956 2,10,38,130,422,1330,4118,12610,38342,116050,350198,1054690,3172262, %T A081956 9533170,28632278,85962370,258018182,774316690,2323474358,6971471650, %U A081956 20916512102,62753730610,188269580438,564825518530,1694510110022 %N A081956 Duplicate of A056182. %K A081956 dead %O A081956 1,1 %A A081956 _Amarnath Murthy_, Apr 02 2003