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 A116253 #2 Mar 30 2012 17:40:40 %S A116253 96012,3812029082958589067221817215313, %T A116253 6187970917041410932778182784685,3189731673290266386838927279556315881 %N A116253 n times n+3 gives the concatenation of two numbers m and m-5. %e A116253 96012 * 96015 = 92185//92180, where // denotes concatenation. %Y A116253 Cf. A116122, A116241, A116252, A116254, A116259. %K A116253 nonn,base %O A116253 1,1 %A A116253 _Giovanni Resta_, Feb 06 2006