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%I #12 Dec 29 2023 13:20:52
%S 0,1,50,1382958493,58205338024195872785464627063218599149502589167918
%N f(f(n+1))-f(f(n)), where f() = Bell numbers = A000110.
%C The next term (a(5)) has 281 digits. - _Harvey P. Dale_, Mar 02 2023
%F Conjecture: a(n)=A061306(n)-A061306(n-1). - _R. J. Mathar_, Apr 23 2007
%t Table[BellB[BellB[n + 1]] - BellB[BellB[n]], {n, 0, 5}] (* _Harvey P. Dale_, Mar 02 2023 *)
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Nov 12 2005
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