OFFSET
1,3
COMMENTS
The series 1/2 + 1/3 + 1/6 + 1/20 + 1/168 + 1/7581 + 1/7828354 + 1/2414682040998 + 1/56130437228687557907788 + ... converges to 1.0560844174127355366763... (since the number of monotone Boolean functions of n variables is strictly smaller than the number of monotone Boolean functions of (n + 1) variables and the limit of its reciprocal is zero as n approaches infinity).
FORMULA
Equals Sum_{k>=0} 1/A000372(k).
EXAMPLE
1.0560844174127355366763...
CROSSREFS
KEYWORD
AUTHOR
Marco Ripà, Jan 04 2021
STATUS
approved