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Search: id:A014767
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| A014767 |
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Order of shuffle group on n cards {0..n-1} generated by i->n-1-i and i->min{2i,2n-1-2i}. |
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1
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| 1, 2, 6, 12, 60, 120, 5040, 32, 181440, 3628800, 39916800, 95040, 3113510400, 87178291200, 1307674368000, 80, 177843714048000, 6402373705728000, 121645100408832000, 1216451004088320000, 25545471085854720000
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 323.
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PROGRAM
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(MAGMA) S := function(n) G := Sym({0..n-1}); p := &*[ G | (i, n-1-i) : i in [ 0..Floor((n-2)/2) ] ];
q := G![ Min(2*i, 2*n-1-2*i):i in [ 0..n-1 ] ]; return Order(sub<G | p, q >); end function;
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CROSSREFS
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Adjacent sequences: A014764 A014765 A014766 this_sequence A014768 A014769 A014770
Sequence in context: A081125 A138570 A139315 this_sequence A002319 A101657 A104371
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KEYWORD
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nonn,easy,nice
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AUTHOR
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njas
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