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A250117 as a simple table

na(n)
01
12
2-10
384
4-868
59872
6-121392
71522000
8-20885744
9249139392
10-4898915424
11-6811333312
12-4215314380800
13-213186664776192
14-15944754147807232
15-1207550934725368320
16-100056122156079206144
17-8876452703027927096320

[1,2,-10,84,-868,9872,-121392,1522000,-20885744,
 249139392,-4898915424,-6811333312,-4215314380800,
 -213186664776192,-15944754147807232,
 -1207550934725368320,-100056122156079206144,
 -8876452703027927096320]