OFFSET
1,1
FORMULA
Equals (3/32)(34 + 27 e^(1/4) sqrt(Pi) erf(1/2)).
Equals 2* 1F1(3;1/2;1/4) . - R. J. Mathar, Aug 27 2024
EXAMPLE
6.186001215875965789280851213604004854378371599...
MATHEMATICA
s = Sum[(k + 2)!/(2 k)!, {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 27 2024
STATUS
approved