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 A071155 #11 Oct 17 2015 22:20:39 %S A071155 0,1,3,5,9,15,11,17,23,33,57,39,63,87,35,59,41,65,89,47,71,95,119,153, %T A071155 273,177,297,417,159,279,183,303,423,207,327,447,567,155,275,179,299, %U A071155 419,161,281,185,305,425,209,329,449,569,167,287,191,311,431,215,335 %N A071155 The Catalan factorial walks (for each rooted plane tree encoded by A014486) encoded as zero-free numbers in factorial base (A007623). %H A071155 C. Banderier, A. Denise, P. Flajolet, M. Bousquet-Mélou, et al., <a href="http://algo.inria.fr/banderier/Papers/DiscMath99.ps">Generating Functions for Generating Trees</a>, Discrete Mathematics 246(1-3), March 2002, pp. 29-55. %H A071155 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms and other excursions amidst the plane trees and parenthesizations</a> (Includes the complete Scheme program for computing this sequence) %Y A071155 Same sequence sorted: A071156, expanded in the factorial number system: A071157. Corresponding Łukasiewicz words: A071153. %Y A071155 Cf. A000108 (row lengths), A120695. %K A071155 base,nonn,tabf %O A071155 0,3 %A A071155 _Antti Karttunen_, May 14 2002