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 A025072 #5 May 12 2023 14:58:26 %S A025072 3,5,7,9,18,22,35,41,47,53,72,80,103,113,140,152,164,176,209,223,260, %T A025072 276,317,335,380,400,420,440,491,513,568,592,651,677,740,768,835,865, %U A025072 895,925,998,1030,1107,1141,1222,1258,1343,1381,1470,1510,1603,1645,1687,1729,1828 %N A025072 s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = (odd natural numbers). %Y A025072 Cf. A023532. %K A025072 nonn %O A025072 1,1 %A A025072 _Clark Kimberling_