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 A120696 #12 Mar 27 2018 11:00:09 %S A120696 0,1,3,5,9,11,15,17,23,33,35,39,41,47,57,59,63,65,71,83,87,89,95,119, %T A120696 153,155,159,161,167,177,179,183,185,191,203,207,209,215,239,273,275, %U A120696 279,281,287,297,299,303,305,311,323,327,329,335,359,395,399,401,407 %N A120696 Numbers whose factorial representation contains no zeros and each digit is at most one larger than the largest following digit. %C A120696 0 is included by considering it to have the empty string as its factorial base representation. %H A120696 Alois P. Heinz, <a href="/A120696/b120696.txt">Rows n = 0..9, flattened</a> %Y A120696 Cf. A000110 (row lengths), A120698, A120695, A120697, A071156. %K A120696 base,nonn,look,tabf %O A120696 0,3 %A A120696 _Franklin T. Adams-Watters_, Jun 28 2006