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 A248578 #9 Nov 11 2024 20:31:07
%S A248578 0,1,2,3,5,7,10,12,16,19,24,28,33,38,44,50,56,63,70,77,85,94,102,112,
%T A248578 121,131,141,152,163,174,186,198,211,224,237,251,265,280,294,310,325,
%U A248578 341,358,375,392,410,428,446,465,484
%N A248578 a(n) = round(1/(Pi-n*sin(Pi/n))).
%C A248578 n*sin(Pi/n) is known as the Archimedean approximation to Pi, the present sequence measures [the reciprocal of] the error. See A248358 for the integer part.
%t A248578 Table[Round[1/(Pi -n Sin[Pi/n])],{n,50}] (* _Harvey P. Dale_, Jun 30 2022 *)
%o A248578 (PARI) a(n)=round(1/(Pi-n*sin(Pi/n)))
%Y A248578 Cf. A248358, A248355.
%K A248578 nonn
%O A248578 1,3
%A A248578 _M. F. Hasler_, Oct 08 2014