%I #8 Dec 05 2013 19:54:50
%S 1,2,52,1382958545,58205338024195872785464627063218599149503972126463
%N Bell Bell numbers: a(n+1) = B(a(n)), where B() are the Bell numbers, A000110.
%C The next term has 281 digits. [From Harvey P. Dale, Nov 28 2011]
%D Amarnath Murthy, Generalization of Partition Function. Introducing Smarandache Factor Partitions.Smarandache Notions Journal, Vol. 11, No. 1-2-3, Spring 2000.
%e a(3) = 52, 5 is the 3rd Bell number and the fifth Bell number is 52.
%p with(combinat): for n from 1 to 6 do printf(`%d,`,bell(bell(n))) od:
%t BellB[BellB[Range[5]]] (* _Harvey P. Dale_, Nov 28 2011 *)
%Y Cf. A000110.
%K nonn,easy
%O 0,2
%A _Amarnath Murthy_, Apr 26 2001
%E More terms from _James A. Sellers_, Sep 26 2001