OFFSET
0,1
FORMULA
Equals Sum_{k>=0} (-3)^k / k!^2.
EXAMPLE
-0.37492595624331005433790651388435...
MATHEMATICA
RealDigits[BesselJ[0, 2 Sqrt[3]], 10, 100][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Nov 28 2023
STATUS
approved