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A002422 as a simple table

na(n)
01
1-10
230
3-20
4-10
5-12
6-20
7-40
8-90
9-220
10-572
11-1560
12-4420
13-12920
14-38760
15-118864
16-371450
17-1179900
18-3801900
19-12406200
20-40940460
21-136468200
22-459029400
23-1556708400
24-5318753700
25-18296512728
26-63334082520

[1,-10,30,-20,-10,-12,-20,-40,-90,-220,-572,-1560,
 -4420,-12920,-38760,-118864,-371450,-1179900,
 -3801900,-12406200,-40940460,-136468200,
 -459029400,-1556708400,-5318753700,-18296512728,
 -63334082520]