OFFSET
1,1
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..1000
FORMULA
r = sum_{n >= 0} p(2,n)*n!/(2*n + 1)!, where p(k,n) is defined at A248664.
EXAMPLE
r = 2.7768896094079797269812451636...
MAPLE
evalf(sum(floor(n/2)!/n!, n=0..infinity), 120); # Vaclav Kotesovec, Oct 17 2014
MATHEMATICA
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Oct 11 2014
STATUS
approved