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A144708 as a simple table

na(n)
01
1-18
2-252
3-2376
4-19440
5-147744
6-1073088
7-7558272
8-52068096
9-352719360
10-2358180864
11-15600273408
12-102308769792
13-666095394816
14-4310029025280
15-27740914089984
16-177729924169728
17-1134086182797312
18-7210756923457536

[1,-18,-252,-2376,-19440,-147744,-1073088,
 -7558272,-52068096,-352719360,-2358180864,
 -15600273408,-102308769792,-666095394816,
 -4310029025280,-27740914089984,-177729924169728,
 -1134086182797312,-7210756923457536]