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A021012 as a simple table

na(n)
01
11
2-1
32
4-4
52
66
7-18
818
9-6
1024
11-96
12144
13-96
1424
15120
16-600
171200
18-1200
19600
20-120
21720
22-4320
2310800
24-14400
2510800
26-4320
27720
285040
29-35280
30105840
31-176400
32176400
33-105840
3435280
35-5040
3640320
37-322560
381128960
39-2257920
402822400
41-2257920
421128960
43-322560
4440320
45362880
46-3265920

[1,1,-1,2,-4,2,6,-18,18,-6,24,-96,144,-96,24,120,
 -600,1200,-1200,600,-120,720,-4320,10800,-14400,
 10800,-4320,720,5040,-35280,105840,-176400,176400,
 -105840,35280,-5040,40320,-322560,1128960,
 -2257920,2822400,-2257920,1128960,-322560,40320,
 362880,-3265920]