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 A116252 #2 Mar 30 2012 17:40:40 %S A116252 80,8156,9800,467346,532653,998000,76450588,99980000,7801738414, %T A116252 8593817622,9208120792,9999800000,346667333466,401461854014, %U A116252 598538145985,653332666533,945207479452,999998000000,48349470735059 %N A116252 n times n+2 gives the concatenation of two numbers m and m-5. %Y A116252 Cf. A116121, A116247, A116251, A116253, A116266. %K A116252 nonn,base %O A116252 1,1 %A A116252 _Giovanni Resta_, Feb 06 2006