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A109590 as a simple table

na(n)
00
1-2
2-2
3-3
4-24
530
6-1584
718648
8-417024
99009792
10-234809280
116704112096
12-213138355968
137406611617600
14-280001933761536
1511429619375628800
16-501128794469154816
1723484526696292281344
18-1171437744670467637248
1961965733479803762540544

[0,-2,-2,-3,-24,30,-1584,18648,-417024,9009792,
 -234809280,6704112096,-213138355968,7406611617600,
 -280001933761536,11429619375628800,
 -501128794469154816,23484526696292281344,
 -1171437744670467637248,61965733479803762540544]