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 A025074 #3 Mar 30 2012 18:56:01 %S A025074 5,7,10,13,25,31,48,56,64,71,98,108,138,153,188,204,220,235,280,297, %T A025074 347,368,422,446,505,531,558,584,651,680,753,785,863,896,980,1017, %U A025074 1105,1144,1184,1224,1319,1362,1463,1507,1615,1661,1774,1824,1941,1993,2115,2170,2226 %N A025074 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = A001950 (upper Wythoff sequence). %K A025074 nonn %O A025074 1,1 %A A025074 _Clark Kimberling_