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A012595 as a simple table

na(n)
01
10
2-1
3-6
4-15
560
6975
75390
8-10143
9-563976
10-5982945
11-9594398
12788690001
1314618418100
1485743956207
15-2026783258890
16-64627785960767
17-716881015039504
187211897523161151
19458865700394648778

[1,0,-1,-6,-15,60,975,5390,-10143,-563976,
 -5982945,-9594398,788690001,14618418100,
 85743956207,-2026783258890,-64627785960767,
 -716881015039504,7211897523161151,
 458865700394648778]