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A009152 as a simple table

na(n)
01
1-1
22
3-4
412
5-36
6128
7-456
81872
9-7888
1037600
11-184064
12990784
13-5444544
1432333824
15-195982208
161272660224
17-8441139456
1859527313920
19-428299217920
203252626013184
21-25165446157312
22204354574172160
23-1689266143553536

[1,-1,2,-4,12,-36,128,-456,1872,-7888,37600,
 -184064,990784,-5444544,32333824,-195982208,
 1272660224,-8441139456,59527313920,-428299217920,
 3252626013184,-25165446157312,204354574172160,
 -1689266143553536]