OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..404
OEIS Wiki, A remarkable formula of Ramanujan
FORMULA
Denominators of coefficients in expansion of sqrt(Pi*x*exp(x)/2) * erf(sqrt(x/2)) / (1 - x). - Ilya Gutkovskiy, May 24 2022
EXAMPLE
MATHEMATICA
Accumulate[Table[1/(2k-1)!!, {k, 20}]]//Denominator (* Harvey P. Dale, Mar 01 2023 *)
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Seiichi Manyama, Sep 02 2017
STATUS
approved