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A012288 as a simple table

na(n)
01
10
20
30
412
5-60
6210
7-1260
818480
9-235872
102421960
11-26091120
12365320296
13-5967877344
1497738612608
15-1617354429600
1629014419932160
17-574177721782144
1812059384791998912
19-262395430866467712

[1,0,0,0,12,-60,210,-1260,18480,-235872,2421960,
 -26091120,365320296,-5967877344,97738612608,
 -1617354429600,29014419932160,-574177721782144,
 12059384791998912,-262395430866467712]