OFFSET
1,2
FORMULA
Equals (1/4)*(2 + e^(1/4)*sqrt(Pi)*erf(1/2)).
Equals A248675/2. - Hugo Pfoertner, Apr 29 2024
EXAMPLE
1.38844480470398986349062258180859403...
MAPLE
hypergeom([2], [3/2], 1/4) ; evalf(%) ; # R. J. Mathar, Jul 03 2024
MATHEMATICA
s = Sum[(k + 1)!/(2 k+1)!, {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 28 2024
STATUS
approved