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 A116249 #2 Mar 30 2012 17:40:40 %S A116249 8,9,98,99,361,635,712,921,998,999,8903,9998,9999,81816,99998,99999, %T A116249 336631,663365,999998,999999,7272725,9999998,9999999,76470587, %U A116249 99999998,99999999,333666331,405436666,428571427,447710183,454545452 %N A116249 n times n+5 gives the concatenation of two numbers m and m-6. %Y A116249 Cf. A116118, A116236, A116248, A116250, A116255. %K A116249 nonn,base %O A116249 1,1 %A A116249 _Giovanni Resta_, Feb 06 2006