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 A116227 #2 Mar 30 2012 17:40:40 %S A116227 44,53,949949,979652,7771781677,7900890078,9920892098,9949999499, %T A116227 38773083432315,41534158410840,47433813119406,52566186880591, %U A116227 58465841589157,61226916567682,72258945037433,86156896546723 %N A116227 n times n+4 gives the concatenation of two numbers m and m-9. %Y A116227 Cf. A116096, A116226, A116228, A116235. %K A116227 nonn,base %O A116227 1,1 %A A116227 _Giovanni Resta_, Feb 06 2006