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 A371801 #7 Apr 28 2024 11:40:50
%S A371801 2,7,6,1,3,2,1,6,6,5,4,4,2,3,9,3,2,3,6,1,5,9,3,2,3,3,7,2,8,2,3,3,8,9,
%T A371801 3,7,0,6,4,4,0,9,8,0,7,7,4,3,7,6,3,8,9,5,9,1,2,8,0,3,5,1,9,7,6,5,8,8,
%U A371801 6,9,1,5,0,6,9,5,3,6,6,8,0,0,8,6,7,1
%N A371801 Decimal expansion of Sum_{k>=0} (-1)^k / (k^2 + 2).
%F A371801 Equals (1/4)*(1 + sqrt(2)*Pi*csch(Pi*sqrt(2))).
%e A371801 0.2761321665442393236159323372823389370644098...
%t A371801 s = N[Sum[(-1)^k/(k^2 + 2), {k, 0, Infinity}], 120]
%t A371801 First[RealDigits[s]]
%Y A371801 Cf. A329083.
%K A371801 nonn,cons
%O A371801 0,1
%A A371801 _Clark Kimberling_, Apr 24 2024