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A015286 as a simple table

n a(n)
3 1
4 -2040
5 4508570
6 -9900819720
7 21752862899691
8 -47790911017216080
9 104996653267533662740
10 -230677643550873536294640
11 506798783502833908602716981
12 -1113436927250681654567602842120

[1,-2040,4508570,-9900819720,21752862899691,
 -47790911017216080,104996653267533662740,
 -230677643550873536294640,
 506798783502833908602716981,
 -1113436927250681654567602842120]

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Last modified February 22 15:26 EST 2020. Contains 332137 sequences. (Running on oeis4.)