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A308499 as a simple table

na(n)
00
11
23
310
434
5104
6200
7-400
8-2800
985120
102163840
1130240000
12285331200
131247769600
14-15759744000
15-392840448000
16-1587505920000
17123384188928000
184345827053568000
1982159404687360000
20749393890172928000
21-10215518583029760000
22-570363673124044800000
23-9916595355495628800000

[0,1,3,10,34,104,200,-400,-2800,85120,2163840,
 30240000,285331200,1247769600,-15759744000,
 -392840448000,-1587505920000,123384188928000,
 4345827053568000,82159404687360000,
 749393890172928000,-10215518583029760000,
 -570363673124044800000,-9916595355495628800000]