OFFSET
1,2
COMMENTS
1.792263004858...
MAPLE
with(combinat, bell): evalf(sum(1/bell(n), n = 1..infinity), 120); # Vaclav Kotesovec, Jan 30 2015
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Franklin T. Adams-Watters, Jun 17 2014
STATUS
approved