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 A024307 #8 Jun 26 2019 18:04:02
%S A024307 0,2,3,0,2,3,4,5,8,3,4,5,6,9,11,13,15,6,7,10,12,14,16,18,20,22,26,13,
%T A024307 15,17,19,21,23,25,29,32,35,38,41,22,24,26,28,32,35,38,41,44,47,50,53,
%U A024307 56,59,35,38,41,44,47,50,53,56,59,62,65,70,74,78,82,86,53,56,59,62,65,68,71,76,80,84
%N A024307 a(n) = 2*t(n) + 3*t(n-1) + ... + (k+1)*t(n+1-k), where k=floor((n+1)/2) and t = A023531.
%F A024307 a(n) = Sum_{k=1..floor((n+1)/2)} (k+1) * A023531(n+1-k). - _Sean A. Irvine_, Jun 26 2019
%K A024307 nonn
%O A024307 1,2
%A A024307 _Clark Kimberling_
%E A024307 a(64) corrected and title simplified by _Sean A. Irvine_, Jun 26 2019