OFFSET
0,1
FORMULA
Equals Product_{k>=2} (1 - 1/(k*(k + 1)*(k + 2)/6)).
Equals Product_{k>=2} (1 - 1/A000292(k)).
EXAMPLE
0.579803252281629531324716112120926682255732653662...
MATHEMATICA
RealDigits[Sqrt[2] Sinh[Sqrt[2] Pi]/(33 Pi), 10, 119][[1]]
PROG
(PARI) sqrt(2)*sinh(sqrt(2)*Pi)/(33*Pi) \\ Michel Marcus, Jun 20 2019
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Jun 19 2019
STATUS
approved