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 A210018 #8 Jun 10 2016 00:21:00 %S A210018 1504326,1506234,1540326,1543026,1543260,2153406,2340615,2341506, %T A210018 2601543,2603154,2603415,2604315,2615034,2615043,2615403,2615430, %U A210018 3026154,3154026,3260154,3260415,3261504,3261540,3402615,3406215,3415026,3415062,4032615,4053216,4061325,4062153,4062315,4132506,4150326,4150623,4302615,4306215,4315026,4315062,4320615,4321506,4326015,4326150,5321406,5321604,6021534,6023415,6041325,6043215,6053214,6132504,6150234,6150432,6203415,6204315,6215034,6215043,6215304,6215340,6230415,6231504,6234015,6234150 %N A210018 In base 7, numbers n which have 7 distinct digits, do not start with 0, and have property that the product (written in base 7) of any two adjacent digits is a substring of n. %C A210018 Computed by Jean-Paul Davalan. %C A210018 The analog in base 2 is 10; in base 3, 102,120,201,210. %H A210018 Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/DixChiffres.htm">10 different digits, 9 products</a> %H A210018 E. Angelini, <a href="/A198298/a198298.pdf">10 different digits, 9 products</a> [Cached copy, with permission] %Y A210018 A generalization of A198298. Cf. A210013-A210020, A203569, A203566. %K A210018 nonn,base,fini,full %O A210018 1,1 %A A210018 _N. J. A. Sloane_, Mar 16 2012