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Bell Bell numbers: a(n+1) = B(a(n)), where B() are the Bell numbers, A000110.
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%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