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A188797 as a simple table

na(n)
01
1-1
2-3
3-9
4-18
5-54
669
7513
84968
914904
10321
1133588
12257580
13502200
141506600
15160839
162808945
1720019960
18162100440
19796330440
202388991320
211416951
22-41843142
23-376375410
24-9465715080
25-144916218720
26-1289959784640
27-3869879353920
28-388946691
29-6519779667

[1,-1,-3,-9,-18,-54,69,513,4968,14904,321,33588,
 257580,502200,1506600,160839,2808945,20019960,
 162100440,796330440,2388991320,1416951,-41843142,
 -376375410,-9465715080,-144916218720,
 -1289959784640,-3869879353920,-388946691,
 -6519779667]