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 A189516 #7 Apr 09 2021 20:33:12 %S A189516 1,3,5,7,10,11,13,16,17,20,22,23,26,27,30,32,33,36,38,40,42,44,46,48, %T A189516 50,52,54,56,58,61,62,64,67,68,71,72,74,77,78,81,83,85,87,89,91,93,95, %U A189516 97,99,101,103,106,107,109,112,113,116,117,119,122,123,126,128,129,132,134,136,138,139,142,144,146,148,150,152,154,157,158,161,162,164,167,168,171 %N A189516 a(n) = n + [nr/s] + [nt/s]; r=1, s=Pi/2, t=2/Pi. %C A189516 See A189515. %t A189516 (See A189515.) %Y A189516 Cf. A189515, A189517. %K A189516 nonn %O A189516 1,2 %A A189516 _Clark Kimberling_, Apr 23 2011