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 A025073 #3 Mar 30 2012 18:56:01 %S A025073 3,4,6,8,15,19,29,34,39,43,60,66,84,94,115,125,135,144,172,182,213, %T A025073 226,259,274,310,326,343,359,400,418,463,483,531,551,603,626,680,704, %U A025073 729,754,812,839,901,928,995,1023,1093,1124,1196,1228,1303,1337,1372,1405,1486,1521,1605 %N A025073 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = A000201 (lower Wythoff sequence). %K A025073 nonn %O A025073 1,1 %A A025073 _Clark Kimberling_