%I A007912
%S A007912 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,
%T A007912 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,
%U A007912 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
%N A007912 Quantum factorials: (n-1)!!-(n-2)!! (mod n).
%D A007912 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.
%H A007912 T. D. Noe, <a href="b007912.txt">Table of n, a(n) for n=3..2000</a>
%Y A007912 Cf. A007911.
%Y A007912 Sequence in context: A098173 A058177 A079508 this_sequence A019755 A085475 
               A157012
%Y A007912 Adjacent sequences: A007909 A007910 A007911 this_sequence A007913 A007914 
               A007915
%K A007912 nonn,easy,nice
%O A007912 3,5
%A A007912 J. H. Conway (conway(AT)math.princeton.edu)