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A090591 as a simple table

na(n)
01
12
2-4
3-24
4-16
5160
6448
7-384
8-4352
9-5632
1023552
1192160
12-4096
13-745472
14-1458176
153047424
1617760256
1711141120
18-119799808
19-328728576
20300941312
213231711232
224055891968
23-17741905920
24-67930947584

[1,2,-4,-24,-16,160,448,-384,-4352,-5632,23552,
 92160,-4096,-745472,-1458176,3047424,17760256,
 11141120,-119799808,-328728576,300941312,
 3231711232,4055891968,-17741905920,-67930947584]