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 A080507 #2 Dec 05 2013 19:56:00 %S A080507 1,5,37,252,202502,2595,3573588375003,2219710571718754, %T A080507 2188822879687504,29549108875781255,250366409274156575302546875005, %U A080507 5789291173553173247164869257812506 %N A080507 Arithmetic mean of n-th row of A080504. %Y A080507 Cf. A080504, A080505, A081556, A080506. %K A080507 nonn %O A080507 1,2 %A A080507 _Amarnath Murthy_, Mar 20 2003