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 A024866 #3 Mar 30 2012 18:56:00 %S A024866 1,1,2,1,3,6,10,10,14,13,18,17,23,22,29,28,36,45,54,53,63,62,73,72,84, %T A024866 83,96,95,109,108,123,122,138,136,152,150,167,185,204,203,223,222,243, %U A024866 242,264,263,286,285,309,308,333,332,358,357,383,381,408,406,434,432,461,459,489 %N A024866 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = A014306. %K A024866 nonn %O A024866 2,3 %A A024866 _Clark Kimberling_