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A157327 as a simple table

na(n)
02
13
2-24
3-81
4160
51215
6-896
7-15309
84608
9177147
10-22528
11-1948617
12106496
1320726199
14-491520
15-215233605
162228224
172195382771
18-9961472
19-22082967873
2044040192
21219667417263
22-192937984
23-2165293113021
24838860800

[2,3,-24,-81,160,1215,-896,-15309,4608,177147,
 -22528,-1948617,106496,20726199,-491520,
 -215233605,2228224,2195382771,-9961472,
 -22082967873,44040192,219667417263,-192937984,
 -2165293113021,838860800]