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Search: id:A127235
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| A127235 |
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a(n) = n! (2*sum(1..n-1))!. |
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+0
3
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| 1, 4, 4320, 11496038400, 291948240981196800000, 190982059064777562218142105600000000, 7081230833474514688657438735472338312479375360000000000
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OFFSET
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1,2
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COMMENT
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Number of distinct n x n matrices containing n^2 different elements which have that same trace.
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MATHEMATICA
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Table[n! (2*Sum[x, {x, 1, n - 1}])!, {n, 1, 10}]
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CROSSREFS
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Cf. A127233, A127234.
Sequence in context: A067482 A013830 A079682 this_sequence A102205 A046360 A079232
Adjacent sequences: A127232 A127233 A127234 this_sequence A127236 A127237 A127238
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Jan 09 2007, Jan 11 2007
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