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A009532 as a simple table

na(n)
00
11
20
3-4
412
5-39
6180
7-1002
86328
9-44843
10351720
11-3010536
1227741780
13-271232571
142763421388
15-28565959606
16284847059760
17-2385962778423
185704285264272
19489538579791348
20-19920957108600740
21598894765796765521

[0,1,0,-4,12,-39,180,-1002,6328,-44843,351720,
 -3010536,27741780,-271232571,2763421388,
 -28565959606,284847059760,-2385962778423,
 5704285264272,489538579791348,-19920957108600740,
 598894765796765521]