OFFSET
0,3
COMMENTS
Each n occurs Bell(n) times.
LINKS
Paolo Xausa, Table of n, a(n) for n = 0..10000
FORMULA
Sum_{n>=1} (-1)^(n+1)/a(n) = Pi/(6*sqrt(3)) + log(3)/2. - Amiram Eldar, Feb 18 2024
MATHEMATICA
Flatten[Array[PadRight[{}, BellB[#], #]&, 7, 0]] (* Paolo Xausa, Feb 13 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Franklin T. Adams-Watters, Jun 28 2006
STATUS
approved