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 A116264 #2 Mar 30 2012 17:40:40 %S A116264 76,4327,5665,9364,41505566065992219341,44035313091289689594, %T A116264 46429818586950933763,48959565612248404016,51040434387751595976, %U A116264 53570181413049066229,55964686908710310398,58494433934007780651 %N A116264 n times n+9 gives the concatenation of two numbers m and m-4. %e A116264 9364 * 9373 = 8776//8772, where // denotes concatenation. %Y A116264 Cf. A116133, A116258, A116263, A116271. %K A116264 nonn,base %O A116264 1,1 %A A116264 _Giovanni Resta_, Feb 06 2006