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 A024602 #6 Jul 17 2019 18:47:07 %S A024602 0,1,4,3,6,4,9,16,25,24,33,31,42,40,53,51,66,64,81,99,118,116,137,135, %T A024602 158,156,181,179,206,204,233,231,262,260,292,288,321,317,352,389,428, %U A024602 426,467,465,508,506,551,549,596,594,643,641,692,690,743,740,793,789,844,840 %N A024602 s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (odd natural numbers), t = A014306. %K A024602 nonn %O A024602 1,3 %A A024602 _Clark Kimberling_ %E A024602 a(59) corrected by _Sean A. Irvine_, Jul 17 2019