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 A056817 #5 Apr 11 2012 10:16:35 %S A056817 0,1,2,4,5,11,17,23,35,70,71,143,215,430,431,863,2158,2159,4319,6479, %T A056817 8639,12959,25918,25919,51839,77759,155518,155519,311039,466559, %U A056817 933118,933119,1866239,2799359,4478975,5598719,16796159 %N A056817 Least inverse of A056796. %H A056817 <a href="/index/Com#complexity">Index to sequences related to the complexity of n</a> %K A056817 nonn %O A056817 0,3 %A A056817 _David W. Wilson_, Sep 07 2000