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A165748 as a simple table

na(n)
01
18
2-48
3400
4-3184
525488
6-203888
71631120
8-13048944
9104391568
10-835132528
116681060240
12-53448481904
13427587855248
14-3420702841968
1527365622735760
16-218924981886064
171751399855088528
18-14011198840708208

[1,8,-48,400,-3184,25488,-203888,1631120,
 -13048944,104391568,-835132528,6681060240,
 -53448481904,427587855248,-3420702841968,
 27365622735760,-218924981886064,1751399855088528,
 -14011198840708208]