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 A080505 #2 Dec 05 2013 19:56:00 %S A080505 1,9,108,1000,1012500,15552,25015118625000,17757684573750000, %T A080505 19699405917187500,295491088757812500,2754030502015722328328015625000, %U A080505 69471494082638078965978431093750000 %N A080505 Last term in n-th row of A080504. %Y A080505 Cf. A080504, A081556, A080506, A080507. %K A080505 nonn %O A080505 1,2 %A A080505 _Amarnath Murthy_, Mar 20 2003