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A012649 as a simple table

n a(n)
0 0
1 2
2 -8
3 8
4 2112
5 -199008
6 22569600
7 -3419806080
8 685509888000
9 -177249701752320
10 57657923420313600
11 -23084838758992066560
12 11165823102677176074240
13 -6422018427189941047418880

[0,2,-8,8,2112,-199008,22569600,-3419806080,
 685509888000,-177249701752320,57657923420313600,
 -23084838758992066560,11165823102677176074240,
 -6422018427189941047418880]

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Last modified February 8 15:16 EST 2023. Contains 360149 sequences. (Running on oeis4.)