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 A043314 #10 Feb 03 2014 12:42:33 %S A043314 1,2,3,4,5,6,7,8,9,100,102,103,104,105,106,107,108,109,200,201,203, %T A043314 204,205,206,207,208,209,300,301,302,304,305,306,307,308,309,400,401, %U A043314 402,403,405,406,407,408,409,500,501,502,503,504 %N A043314 a(n)=A033008(n)/11. %C A043314 Also, numbers which, written in base 100, have all digits < 10 and no adjacent digits equal. - _M. F. Hasler_, Feb 03 2014 %o A043314 (PARI) is_A043314(n)=(n=[n])&&!until(!n[1],((n=divrem(n[1],100))[2]<10 && n[1]%10!=n[2])||return) \\ _M. F. Hasler_, Feb 03 2014 %Y A043314 Cf. A043307 - A043320, A043291, A033001 - A033014, A033016 - A033029. %K A043314 nonn,base %O A043314 1,2 %A A043314 _Clark Kimberling_