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A009357 as a simple table

na(n)
00
11
2-1
30
42
5-20
6104
7-560
82512
9-7920
10-32896
111034880
12-14979328
13172569280
14-1684304896
1512339608320
16-15173408768
17-1902800305920
1853242752303104
19-1037015219466240
2016518488951816192
21-208832669083243520

[0,1,-1,0,2,-20,104,-560,2512,-7920,-32896,
 1034880,-14979328,172569280,-1684304896,
 12339608320,-15173408768,-1902800305920,
 53242752303104,-1037015219466240,
 16518488951816192,-208832669083243520]