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 A072336 #4 Mar 30 2012 16:49:29 %S A072336 1,3,15,61,250,966,3691,13708,50198,180756,642883,2259194,7859454, %T A072336 27086808,92579267,314011481,1057679231,3539727315,11776328715, %U A072336 38963355007,128255099092,420155031109,1370225125574,4449779889260,14393128980829,46380744221539 %N A072336 EULER transform of A064831 (with its initial 1 omitted). %H A072336 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %K A072336 nonn %O A072336 0,2 %A A072336 _N. J. A. Sloane_, Jul 16 2002