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 A100445 #4 Mar 31 2012 10:29:05 %S A100445 1,11,309,16687,1468457,190899411,34361893981,8178130767479, %T A100445 2486151753313617,939765362752547227,432292066866171724421, %U A100445 237760636776394448431551,154068892631103602583645049 %N A100445 Bisection of A000255. %K A100445 nonn,easy %O A100445 0,2 %A A100445 _N. J. A. Sloane_, Nov 21 2004 %E A100445 More terms from _Hugo Pfoertner_, Nov 26 2004