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 A255121 #5 Feb 14 2015 21:29:38 %S A255121 0,1,2,2,3,3,3,4,4,4,4,4,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6, %T A255121 6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8, %U A255121 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9 %N A255121 After zero, each n occurs A255071(n) times. %C A255121 An auxiliary sequence for computing A255122 and A255056. %H A255121 Antti Karttunen, <a href="/A255121/b255121.txt">Table of n, a(n) for n = 0..721</a> %o A255121 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A255121 (define A255121 (COMPOSE -1+ (LEAST-GTE-I 0 1 A255061))) %Y A255121 Cf. A255056, A255061, A255071, A255122. %Y A255121 Similar sequence: A213711. %K A255121 nonn %O A255121 0,3 %A A255121 _Antti Karttunen_, Feb 14 2015