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 A024374 #4 Mar 30 2012 18:55:54 %S A024374 2,5,7,10,20,25,41,48,56,64,86,98,126,138,173,188,204,220,261,280,325, %T A024374 347,399,422,480,505,531,558,623,651,721,753,829,863,943,980,1066, %U A024374 1105,1144,1184,1278,1319,1419,1463,1567,1615,1723,1774,1889,1941,2061,2115,2170 %N A024374 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A023532, t = A001950 (upper Wythoff sequence). %K A024374 nonn %O A024374 1,1 %A A024374 _Clark Kimberling_