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A007912 Quantum factorials: (n-1)!!-(n-2)!! (mod n). 4
1, 1, 0, 1, 5, 1, 0, 1, 2, 3, 0, 1, 0, 1, 0, 9, 2, 15, 0, 1, 2, 9, 0, 1, 0, 7, 0, 15, 2, 1, 0, 1, 0, 27, 0, 1, 0, 25, 0, 21, 2, 11, 0, 1, 45, 33, 0, 25, 0, 39, 0, 27, 0, 49, 0, 1, 57, 15, 0, 1, 0, 1, 0, 33, 2, 51, 0, 35, 2, 9, 0, 1, 0, 19, 0, 39, 77, 65, 0, 1, 81, 63, 0, 1, 0, 33, 0, 45, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,5

REFERENCES

S. P. Hurd and J. S. McCranie, Quantum factorials. Proceedings of the Twenty-fifth Southeastern International Conference on Combinatorics, Graph Theory and Computing (Boca Raton, FL, 1994). Congr. Numer. 104 (1994), 19-24.

LINKS

T. D. Noe, Table of n, a(n) for n=3..2000

MATHEMATICA

Table[Mod[(n-1)!!-(n-2)!!, n], {n, 3, 100}] (* Harvey P. Dale, Aug 07 2012 *)

CROSSREFS

Cf. A007911.

Sequence in context: A293087 A209349 A242095 * A019755 A085475 A211399

Adjacent sequences:  A007909 A007910 A007911 * A007913 A007914 A007915

KEYWORD

nonn,easy,nice

AUTHOR

J. H. Conway

STATUS

approved

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Last modified February 16 12:48 EST 2019. Contains 320163 sequences. (Running on oeis4.)