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 A026277 #4 Mar 30 2012 18:56:05 %S A026277 1,2,3,5,7,9,10,12,13,15,16,18,20,21,23,25,26,28,30,31,33,34,36,38,39, %T A026277 41,42,44,46,47,49,50,52,54,55,57,59,60,62,63,65,67,68,70,72,73,75,76, %U A026277 78,80,81,83,85,86,88,89,91,93,94,96,97,99 %N A026277 a(n) = least k such that s(k) = n, where s = A026276. %K A026277 nonn %O A026277 1,2 %A A026277 _Clark Kimberling_