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Search: id:A063965
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| A063965 |
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Size of the automorphism group of the group S_n x S_n (where S_n is the symmetric group ). |
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+0
1
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| 1, 6, 72, 1152, 28800, 4147200, 50803200, 3251404800, 263363788800, 26336378880000, 3186701844480000, 458885065605120000, 77551576087265280000, 15200108913103994880000
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Except for n=1, 2, 6 a(n) = A048617(n) = 2 * (n!)^2
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MAPLE
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a := proc(n) option remember: if n=1 then RETURN(1) fi: if n=2 then RETURN(6) fi: if n=6 then RETURN(4147200) fi: 2*(n!)^2: end: for n from 1 to 30 do printf(`%d, `, a(n)) od:
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CROSSREFS
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A060249, A048617.
Sequence in context: A113331 A052678 A052719 this_sequence A047058 A001763 A003235
Adjacent sequences: A063962 A063963 A063964 this_sequence A063966 A063967 A063968
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KEYWORD
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nonn
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AUTHOR
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Ahmed Fares (ahmedfares(AT)my-deja.com), Sep 04 2001
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Sep 26 2001
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