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 A281067 #16 Feb 19 2017 07:12:09 %S A281067 1,8,10,19,91,801,802,1001,8001,8002,100001,800001,800002,1000000, %T A281067 9000000,9000001,11000000,19000000,19000001,80000000,90000000, %U A281067 90000001,800000000,900000000,900000001,8000000000,9000000000,9000000001,11000000000,19000000000,19000000001,80000000000,90000000000,90000000001 %N A281067 a(1) = 1; a(n) is the smallest natural number such that a(n) > a(n-1), and the name of a(n) in English starts with the letter a(n-1) ends with, and a(n) makes the sequence extendable. %C A281067 "a(n) makes the sequence extendable" means the name of a(n) does not end with any of the letters r, x, y and d. %e A281067 If a(5) were 90 (ninety, which ends with y), it would make the sequence finite. Therefore, a(5) has to be 91. %Y A281067 Cf. A277971, A277972, A281068. %K A281067 easy,nonn,word %O A281067 1,2 %A A281067 _Ivan N. Ianakiev_, Jan 14 2017