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 A327555 #13 Nov 09 2019 01:33:36
%S A327555 1,3,5,3,3,8,9,2,3,4,1,1,7,6,7,5,8,4,1,9,3,5,7,0,8,9,0,5,7,6,0,4,8,7,
%T A327555 2,7,2,2,0,0,5,0,7,5,8,4,3,3,1,5,8,4,3,6,9,4,1,2,5,2,5,4,5,6,6,1,2,2,
%U A327555 3,8,4,2,2,7,4,1,8,0
%N A327555 Decimal expansion of number with continued fraction expansion [1; 2, 1, 4, 1, 6, 1, 8, 1, 10, 1, ...].
%C A327555 The continued fraction with even numbers and 1 alternated in opposition to A049471, that is, tan(1): [1; 1, 1, 3, 1, 5, 1, 7, 1, 9, 1, ...].
%e A327555 1.353389234117675841935...
%t A327555 N[FromContinuedFraction[Flatten[Table[{1, 2*k}, {k, 1, 100}]]], 100] (* _Vaclav Kotesovec_, Nov 08 2019 *)
%Y A327555 Cf. A049471, A093178.
%K A327555 nonn,cons
%O A327555 1,2
%A A327555 _Steven Ricardo Villeda Marroquín_, Sep 16 2019