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A092399 Smarandacheials for k=5. 8
-24, -42, 336, 216, 2500, 2376, 4032, -52416, -33264, -562500, -532224, -891072, 16039296 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A generalization of quintuple factorials: back and forth (1972).

REFERENCES

J. Dezert, editor, Smarandacheials, Mathematics Magazine, Aurora, Canada, No. 4/2004 (to appear).

F. Smarandache, Back and Forth Factorials, Arizona State Univ., Special Collections, 1972.

LINKS

Table of n, a(n) for n=0..12.

J. Dezert, Smarandacheials

FORMULA

a(n) = !n!_5 = Prod_{i=0, 1, 2, ... .}_{0<|n-5i|<=n}(n-5i) = n(n-5)(n-10)....

EXAMPLE

!11!_5 = 11(11-5)(11-10)(11-15)(11-20) = 11(6)(1)(-4)(-9) = 2376.

CROSSREFS

Sequence in context: A043234 A044014 A087093 * A118299 A258865 A072096

Adjacent sequences:  A092396 A092397 A092398 * A092400 A092401 A092402

KEYWORD

sign

AUTHOR

J. Dezert (Jean.Dezert(AT)onera.fr), Mar 21 2004

STATUS

approved

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Last modified August 29 02:15 EDT 2015. Contains 261184 sequences.