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A108095 as a simple table

na(n)
01
17
2-24
3168
4-1464
514280
6-149208
71633128
8-18483576
9214552968
10-2540241816
1130557794344
12-372427799352
134588869057864
14-57068241380952
15715388746153704
16-9030126770703096
17114677768635083528
18-1464172925174652696
1918783553808927819688
20-242002474839216810168

[1,7,-24,168,-1464,14280,-149208,1633128,
 -18483576,214552968,-2540241816,30557794344,
 -372427799352,4588869057864,-57068241380952,
 715388746153704,-9030126770703096,
 114677768635083528,-1464172925174652696,
 18783553808927819688,-242002474839216810168]