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Concatenate factorials.
5

%I #21 Feb 17 2024 10:31:33

%S 1,12,126,12624,12624120,12624120720,126241207205040,

%T 12624120720504040320,12624120720504040320362880,

%U 126241207205040403203628803628800,12624120720504040320362880362880039916800,12624120720504040320362880362880039916800479001600

%N Concatenate factorials.

%D M. Le, On Smarandache Concatenated Sequences II: Factorial Sequence, Smarandache Notions Journal, Vol. 9, No. 1-2, 1998, 131-132.

%H Vincenzo Librandi, <a href="/A045508/b045508.txt">Table of n, a(n) for n = 1..40</a>

%t nn=20;With[{f=Range[nn]!},Table[FromDigits[Flatten[ IntegerDigits/@ Take[ f,n]]],{n,nn}]] (* _Harvey P. Dale_, Jan 27 2015 *)

%Y Cf. A000142, A007908.

%K nonn,base,easy

%O 1,2

%A _Jeff Burch_

%E More terms from _Harvey P. Dale_, Jan 27 2015