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A087220 as a simple table

na(n)
01
12
2-2
3-12
4126
5-84
6-10532
772584
81398454
9-23934644
10-279791836
1110005551128
1274538179116
13-5628788533000
14-20339727800264
154187789575589776
16-1855072071151834
17-4010464443848609780

[1,2,-2,-12,126,-84,-10532,72584,1398454,
 -23934644,-279791836,10005551128,74538179116,
 -5628788533000,-20339727800264,4187789575589776,
 -1855072071151834,-4010464443848609780]