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 A019267 #10 Sep 27 2019 05:57:37
%S A019267 1,1,1,-1,-5,23,53,-593,-5165,110123,231743,-8113223,-33497425,
%T A019267 1744764499,3563384029,-258115578289,-4191097954685,402402297433523,
%U A019267 813628574192123,-99925014024526283,-403078530716889835,61606956815080291849
%N A019267 From an asymptotic expansion for Pi.
%D A019267 R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 481.
%p A019267 v := asympt(16^n/(2*n)!^2*n!^4/n,n,24); seq(numer(op(i,v)),i=1..nops(v));
%t A019267 nmax = 20; Numerator[CoefficientList[Series[Binomial[2 n, n]^2/(2^(4 n)/Pi/n), {n, Infinity, nmax}], 1/n]]*(-1)^Range[0, nmax] (* _Vaclav Kotesovec_, Sep 27 2019 *)
%Y A019267 Cf. A002894.
%K A019267 sign
%O A019267 0,5
%A A019267 _Simon Plouffe_