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 A189517 #7 Apr 09 2021 20:38:31 %S A189517 4,9,14,19,24,29,34,39,45,49,55,59,65,69,75,80,84,90,94,100,104,110, %T A189517 115,120,125,130,135,140,145,151,155,160,165,170,175,180,186,190,196, %U A189517 200,206,210,216,221,226,231,235,241,245,251,256,261,266,271,276,281,286,292,296,302,306,311,316,321,327,331,337,341,347,351,357,362,367,372,377,382,386,392,397,402,407,412,417 %N A189517 a(n) = n + [nr/t] + [ns/t]; r=1, s=Pi/2, t=2/Pi. %C A189517 See A189515. %t A189517 (See A189515.) %Y A189517 Cf. A189515, A189516. %K A189517 nonn %O A189517 1,1 %A A189517 _Clark Kimberling_, Apr 23 2011