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Search: id:A127234
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| A127234 |
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a(n) = n! (sum(1..n-1))!. |
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+0
3
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| 1, 2, 36, 17280, 435456000, 941525544960000, 257498348545415577600000, 1229309805474430285542064128000000
(list; graph; listen)
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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 symetrical matrices containing A000217(n+1) different elements which have that same trace.
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MATHEMATICA
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Table[n! (Sum[x, {x, 1, n-1}])!, {n, 1, 10}]
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CROSSREFS
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Cf. A127233, A127235.
Sequence in context: A004003 A060739 A134366 this_sequence A051459 A073581 A078081
Adjacent sequences: A127231 A127232 A127233 this_sequence A127235 A127236 A127237
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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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