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 A291050 #28 Oct 01 2022 01:06:14
%S A291050 3,6,5,5,4,0,9,0,3,7,4,4,0,5,0,3,1,9,2,1,6,0,9,2,2,5,9,2,5,4,6,7,2,2,
%T A291050 6,4,2,7,0,8,7,7,7,5,5,8,2,3,7,3,2,9,8,6,1,6,3,4,5,7,3,8,4,3,0,4,4,4,
%U A291050 6,1,0,4,5,3,4,0,4,4,6,3,8,6,2,9,6,9,5,3,1,1,2,4,8,8,3,5,2,6,7,8,4,5,3,3,4,2,9,3,1,0,2,7,4,1,5,9,7,9,2,8,8,0,6,3,8,3,2,6,3,7,7,8,8,9,0,6,1,9,5,4,1,1,3,3,9,8,8,0,7,3,5,2
%N A291050 Decimal expansion of Pi^2 / 27.
%H A291050 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A291050 Equals Sum_{n>=1} 1/A047235(n)^2.
%F A291050 Equals A002388 / 27. - _Felix Fröhlich_, Oct 22 2017
%e A291050 0.365540903744050319216092259254672264270877755823732986163457384304446104534...
%t A291050 RealDigits[Pi^2/27,10,160][[1]] (* _Harvey P. Dale_, Apr 29 2019 *)
%o A291050 (PARI) Pi^2 / 27
%Y A291050 Cf. A002388, A047235.
%K A291050 nonn,cons,easy
%O A291050 0,1
%A A291050 _Dimitris Valianatos_, Oct 20 2017