A111402 f(f(n+1))-f(f(n)), where f() = Bell numbers = A000110.

0, 1, 50, 1382958493, 58205338024195872785464627063218599149502589167918

Offset

0,3

Comments

The next term (a(5)) has 281 digits. - Harvey P. Dale, Mar 02 2023

Links

Table of n, a(n) for n=0..4.

Formula

Conjecture: a(n)=A061306(n)-A061306(n-1). - R. J. Mathar, Apr 23 2007

Mathematica

Table[BellB[BellB[n + 1]] - BellB[BellB[n]], {n, 0, 5}] (* Harvey P. Dale, Mar 02 2023 *)

Crossrefs

Sequence in context: A015062 A015038 A152515 * A174732 A087408 A255852

Adjacent sequences: A111399 A111400 A111401 * A111403 A111404 A111405

Keyword

nonn

Author

N. J. A. Sloane, Nov 12 2005

Status

approved