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A127145 as a simple table

na(n)
01
11
21
3-2
4-9
54
675
724
8-735
9-816
108505
1117760
12-114345
13-388800
141756755
159233280
16-30405375
17-242968320
18585810225
197125511680
20-12439852425
21-232838323200
22288735522075
238450546227200
24-7273385294175
25-339004760371200
26197646339515625
2714945696794828800
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]