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 A116272 #2 Mar 30 2012 17:40:40 %S A116272 6,7282818,8171728,4550754022124826467,5449245977875173533, %T A116272 8176518705147900806,8951999555715882882349355522889, %U A116272 9861090464806791973258446431980 %N A116272 n times n+1 gives the concatenation of two numbers m and m-2. %e A116272 8171728 * 8171729 = 6677714//6677712, where // denotes %e A116272 concatenation. %Y A116272 Cf. A116141, A116265, A116273, A116285. %K A116272 nonn,base %O A116272 1,1 %A A116272 _Giovanni Resta_, Feb 06 2006