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 A024373 #4 Mar 30 2012 18:55:54 %S A024373 1,3,4,6,12,15,25,29,34,39,52,60,77,84,106,115,125,135,160,172,199, %T A024373 213,245,259,295,310,326,343,383,400,443,463,510,531,580,603,656,680, %U A024373 704,729,787,812,874,901,965,995,1061,1093,1164,1196,1270,1303,1337,1372,1450,1486 %N A024373 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = A000201 (lower Wythoff sequence). %K A024373 nonn %O A024373 1,2 %A A024373 _Clark Kimberling_