OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Bell Number
FORMULA
a(n) ~ 10^n * n. - Charles R Greathouse IV, Aug 11 2011
MATHEMATICA
f[n_] := Sum[ StirlingS2[n, k], {k, n}]; Table[ Length[ IntegerDigits[ f[10^n]]], {n, 0, 4}] (* Robert G. Wilson v, Oct 12 2005 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric W. Weisstein, Oct 10 2005
EXTENSIONS
a(5)-a(10) from Charles R Greathouse IV, Aug 11 2011
STATUS
approved