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 A024888 #8 Jul 27 2019 12:06:38 %S A024888 0,0,7,10,13,15,18,20,38,44,48,54,60,64,70,75,106,114,121,130,137,145, %T A024888 153,160,169,177,223,233,244,255,265,275,286,297,307,317,328,339,403, %U A024888 416,430,442,456,469,481,496,508,521,534,547,561,574,659,675,690,707,722,737,755 %N A024888 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023531, t = A001950 (upper Wythoff sequence). %Y A024888 Cf. A001950, A023531. %K A024888 nonn %O A024888 2,3 %A A024888 _Clark Kimberling_