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Search: id:A007911
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| 1, 1, 5, 7, 33, 57, 279, 561, 2895, 6555, 35685, 89055, 509985, 1381905, 8294895, 24137505, 151335135, 468934515, 3061162125, 10033419375, 68000295825, 234484536825, 1645756410375, 5943863027025, 43105900812975
(list; graph; listen)
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OFFSET
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3,3
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REFERENCES
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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.
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LINKS
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T. D. Noe, Table of n, a(n) for n=3..100
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MAPLE
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P:=proc(n) local i, j, k, w; for i from 1 by 1 to n do k:=i; w:=i-2; while w>0 do k:=k*w; w:=w-2; od; j:=i+1; w:=i-1; while w>0 do j:=j*w; w:=w-2; od; print(j-k); od; end: P(100); - Paolo P. Lava (ppl(AT)spl.at), Jun 14 2007
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CROSSREFS
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Cf. A007912.
Sequence in context: A025114 A090935 A104815 this_sequence A066172 A018353 A081851
Adjacent sequences: A007908 A007909 A007910 this_sequence A007912 A007913 A007914
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KEYWORD
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nonn,easy
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AUTHOR
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J. H. Conway (conway(AT)math.princeton.edu)
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