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A009148 as a simple table

na(n)
01
10
20
30
412
5-60
6210
7-1260
811760
9-114912
101111560
11-11676720
12138570696
13-1799232864
1425005472128
15-371229549600
165885388887040
17-99270313446784
181773606197591232
19-33452898176207232
20664355584657373312

[1,0,0,0,12,-60,210,-1260,11760,-114912,1111560,
 -11676720,138570696,-1799232864,25005472128,
 -371229549600,5885388887040,-99270313446784,
 1773606197591232,-33452898176207232,
 664355584657373312]