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 A024686 #3 Mar 30 2012 18:55:59 %S A024686 2,5,22,31,71,94,175,212,349,403,597,679,957,1065,1420,1568,2032,2212, %T A024686 2802,3016,3718,3987,4839,5152,6169,6529,7693,8122,9480,9962,11486, %U A024686 12051,13792,14420,16398,17088,19268,20054,22495,23355,26015,26984,29932,30978 %N A024686 s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence). %K A024686 nonn %O A024686 1,1 %A A024686 _Clark Kimberling_