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 A125019 #5 Mar 31 2012 10:22:00 %S A125019 2,9,12,57,99,165,486,681,810,1854 %N A125019 Records in A063983 if the initial 4 is ignored (cf. A125848). %Y A125019 Cf. A124742, A063983, A125848. %K A125019 nonn %O A125019 1,1 %A A125019 _Artur Jasinski_, Nov 16 2006 %E A125019 Corrected and extended by _R. J. Mathar_, Nov 29 2006