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A127235 a(n) = n! (2*sum(1..n-1))!. 2
1, 4, 4320, 11496038400, 291948240981196800000, 190982059064777562218142105600000000, 7081230833474514688657438735472338312479375360000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of distinct n x n matrices containing n^2 different elements which have that same trace.

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

Table[n! (2*Sum[x, {x, 1, n - 1}])!, {n, 1, 10}]

CROSSREFS

Cf. A127233, A127234.

Sequence in context: A067482 A249804 A079682 * A274972 A344670 A344671

Adjacent sequences:  A127232 A127233 A127234 * A127236 A127237 A127238

KEYWORD

nonn

AUTHOR

Artur Jasinski, Jan 09 2007, Jan 11 2007

STATUS

approved

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Last modified October 18 12:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)