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 A102826 #4 Oct 06 2013 23:40:29 %S A102826 0,1,2,3,4,6,7,8,11,12,16,18,19,22,23,26,27,31,32,39,40,43,44,48,55, %T A102826 56,60,64,69,70,74,75,79,86,87,90,91,95,96,103,104,107,108,112,119, %U A102826 120,124,128,138,139,143,151,152,155,156,160,163,167,171,172,176 %N A102826 "True already", base 4, start 0: a(n) is the least integer such that the sequence up to a(n-1) written in base 4 contains floor(a(n)/4) copies of the digit a(n) % 4, with a(0) = 0. %D A102826 Inspired by discussion of "True so far" from _Eric Angelini_ (A102357). %Y A102826 Cf. A102823-A102830, A102357. %K A102826 nonn,easy,base %O A102826 0,3 %A A102826 _Hugo van der Sanden_, Feb 26 2005