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 A024871 #3 Mar 30 2012 18:56:00 %S A024871 0,2,5,3,6,5,9,12,17,16,22,21,26,24,31,39,48,47,55,53,63,61,72,70,82, %T A024871 93,106,104,118,116,131,129,145,141,157,154,171,189,208,206,226,224, %U A024871 243,240,261,258,280,277,300,297,321,346,370,367,393,390,417,414,442,439,468,465,495 %N A024871 s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers >= 2), t = A023532. %K A024871 nonn %O A024871 2,2 %A A024871 _Clark Kimberling_