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 A024306 #7 Jan 09 2024 11:48:35 %S A024306 6,8,22,27,52,61,100,114,170,190,266,293,392,427,552,596,750,804,990, %T A024306 1055,1276,1353,1612,1702,2002,2106,2450,2569,2960,3095,3536,3688, %U A024306 4182,4352,4902,5091,5700,5909,6580,6810,7546,7798,8602,8877,9752,10051,11000,11324 %N A024306 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k=[ (n+1)/2 ], s = (natural numbers >= 2), t = (natural numbers >= 3). %F A024306 [4n^3+45n^2+116n+48 -3(n+4)^2(-1)^n]/48. %K A024306 nonn %O A024306 1,1 %A A024306 _Clark Kimberling_