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A190392 as a simple table

na(n)
11
21
30
4-4
5-12
64
7240
81184
9-1008
10-59504
11-401280
12643136
1338584128
14323581504
15-848090880
16-51666451456
17-509739310848
182004840714496
19123888658698240
201386061762251776
21-7721141999864832
22-483475390212586496
23-5974101514137292800
2445231727252157947904

[1,1,0,-4,-12,4,240,1184,-1008,-59504,-401280,
 643136,38584128,323581504,-848090880,-51666451456,
 -509739310848,2004840714496,123888658698240,
 1386061762251776,-7721141999864832,
 -483475390212586496,-5974101514137292800,
 45231727252157947904]