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 A127758 #11 Jul 26 2020 09:03:37
%S A127758 1,2,3,6,8,11,14,18,22,26,30,35,40,46,51,58,64,71,77,85,92,100,108,
%T A127758 116,125,134,143,152,162,172,182,193,204,215,226,238,249,261,274,286,
%U A127758 299,312,326,339,353,367,381,396,411,426,441,457,473,489,505,521,538,555
%N A127758 Integer part of Gauss's Arithmetic-Geometric Mean M(1,n^2).
%F A127758 a(n) ~ Pi*n^2/(4*log(2*n)). - _Vaclav Kotesovec_, May 09 2016
%t A127758 Table[Floor[ArithmeticGeometricMean[1, n^2]], {n, 1, 100}]
%Y A127758 Cf. A127757, A127759, A127760, A127761.
%K A127758 nonn
%O A127758 1,2
%A A127758 _Artur Jasinski_, Jan 28 2007