A019515 a(n) = 1 + 0!*1!*2!*...*n!.

2, 2, 3, 13, 289, 34561, 24883201, 125411328001, 5056584744960001, 1834933472251084800001, 6658606584104736522240000001, 265790267296391946810949632000000001

Offset

0,1

References

M. Le, On the Interesting Smarandache Product Sequences, Smarandache Notions Journal, Vol. 9, No. 1-2, 1998, 133-134.

F. Iacobescu, Smarandache Partition Type and Other Sequences, Bull. Pure Appl. Sciences, Vol. 16E, No. 2 (1997), pp. 237-240.

Links

G. C. Greubel, Table of n, a(n) for n = 0..40

F. Smarandache, Collected Papers, Vol. II, Vol. II, Tempus Publ. Hse., Bucharest, Romania, 1996.

F. Smarandache, Sequences of Numbers Involved in Unsolved Problems.

Eric Weisstein's World of Mathematics, Smarandache Sequences

Formula

a(n) = A000178(n) + 1.

Mathematica

FoldList[Times, 1, Range[12]!]+1 (* Harvey P. Dale, Dec 11 2012 *)

Crossrefs

Cf. A000178.

Sequence in context: A100362 A062439 A139521 * A094352 A073828 A338523

Adjacent sequences: A019512 A019513 A019514 * A019516 A019517 A019518

Keyword

nonn,easy

Author

R. Muller

Extensions

Name corrected by Arkadiusz Wesolowski, Oct 03 2011

Status

approved