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 A116284 #2 Mar 30 2012 17:40:40 %S A116284 32,60,804,4778,5214,7406,48208886,51791106,77620651,4291816088, %T A116284 4482541430,5517458562,5708183904,9036996876,9737360643, %U A116284 3579205562000136225339579331,3939042613182345526485238179 %N A116284 n times n+9 gives the concatenation of two numbers m and m-1. %Y A116284 Cf. A116153, A116278, A116283, A116293. %K A116284 nonn,base %O A116284 1,1 %A A116284 _Giovanni Resta_, Feb 06 2006