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 A116321 #2 Mar 30 2012 17:40:40 %S A116321 36,56,35161,64831,80616,3987149564,4383189168,5616810824,6012850428, %T A116321 7706615964,8102655568,4345867705884192320,4745041385024898581, %U A116321 5254958614975101411,5654132294115807672,79423444003688998051750982 %N A116321 n times n+9 gives the concatenation of two numbers m and m+4. %Y A116321 Cf. A116190, A116313, A116320, A116328. %K A116321 nonn,base %O A116321 1,1 %A A116321 _Giovanni Resta_, Feb 06 2006