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 A277050 #17 Sep 29 2016 14:18:07
%S A277050 0,1,2,3,4,5,6,7,9,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,27,28,
%T A277050 29,30,31,32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,53,54,
%U A277050 55,56,57,58,59,60,62,63,64,65,66,67,68,69,71,72,73,74,75
%N A277050 a(n) = floor(2*n/sqrt(Pi)).
%H A277050 Paulo Romero Zanconato Pinto, <a href="/A277050/b277050.txt">Table of n, a(n) for n = 0..10000</a>
%H A277050 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a>
%F A277050 a(n) = floor(2*n/sqrt(Pi)).
%p A277050 A277050:=n->floor(2*n/sqrt(Pi)): seq(A277050(n), n=0..100); # _Wesley Ivan Hurt_, Sep 26 2016
%t A277050 Table[Floor[2 * n/Sqrt[Pi]], {n, 100}]
%o A277050 (PARI) a(n) = floor(2*n/sqrt(Pi));
%Y A277050 Cf. A037086, A190732, A277052 (complement).
%K A277050 nonn,easy
%O A277050 0,3
%A A277050 _Paulo Romero Zanconato Pinto_, Sep 26 2016