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A127145 as a simple table

n a(n)
0 1
1 1
2 1
3 -2
4 -9
5 4
6 75
7 24
8 -735
9 -816
10 8505
11 17760
12 -114345
13 -388800
14 1756755
15 9233280
16 -30405375
17 -242968320
18 585810225
19 7125511680
20 -12439852425
21 -232838323200
22 288735522075
23 8450546227200
24 -7273385294175
25 -339004760371200
26 197646339515625
27 14945696794828800
28 -5763367260275625

[1,1,1,-2,-9,4,75,24,-735,-816,8505,17760,-114345,
 -388800,1756755,9233280,-30405375,-242968320,
 585810225,7125511680,-12439852425,-232838323200,
 288735522075,8450546227200,-7273385294175,
 -339004760371200,197646339515625,
 14945696794828800,-5763367260275625]

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Last modified December 10 12:15 EST 2019. Contains 329895 sequences. (Running on oeis4.)