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 A323778 #4 Jan 27 2019 06:20:29
%S A323778 3,6,5,4,9,8,4,9,8,2,1,9,8,5,8,0,4,4,5,7,9,7,3,6,8,7,5,4,4,6,2,9,9,0,
%T A323778 8,8,3,2,2,7,5,8,8,0,6,9,6,3,4,6,0,2,9,5,0,1,5,9,5,5,1,6,7,6,8,2,1,1,
%U A323778 8,8,3,6,7,4,0,8,4,8,7,3,0,0,3,5,2,2,8,4,1,0,7,4,0,8,2,1,5,4,8,5,3,8,7,5,7,8
%N A323778 Decimal expansion of the root of the equation (1-r)^(2-2*r) * r^(2*r) = 1-2*r.
%e A323778 0.36549849821985804457973687544629908832275880696346029501595516768211883674...
%t A323778 RealDigits[r/.FindRoot[(1-r)^(2-2*r) * r^(2*r) == 1-2*r, {r, 1/3}, WorkingPrecision->250], 10, 200][[1]]
%Y A323778 Cf. A123165, A206851.
%Y A323778 Cf. A220359, A237421, A245259, A323768, A323773, A323777.
%K A323778 nonn,cons
%O A323778 0,1
%A A323778 _Vaclav Kotesovec_, Jan 27 2019