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A007242 as a simple table

na(n)
01
1-492
2-22590
3-367400
4-3764865
5-28951452
6-182474434
7-990473160
8-4780921725
9-20974230680
10-84963769662
11-321583404672
12-1147744866180
13-3890805976500
14-12601590210180
15-39183052547592
16-117437602167291
17-340431109329600
18-957251463332600
19-2617490612355240
20-6975126788952456
21-18149106017123576
22-46187557595906250

[1,-492,-22590,-367400,-3764865,-28951452,
 -182474434,-990473160,-4780921725,-20974230680,
 -84963769662,-321583404672,-1147744866180,
 -3890805976500,-12601590210180,-39183052547592,
 -117437602167291,-340431109329600,
 -957251463332600,-2617490612355240,
 -6975126788952456,-18149106017123576,
 -46187557595906250]