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A137852 as a simple table

na(n)
11
21
3-2
49
5-24
6130
7-720
88505
9-35840
10412776
11-3628800
1242030450
13-479001600
147019298000
15-82614884352
161886805545625
17-20922789888000
18374426276224000
19-6402373705728000
20134987215801622184
21-2379913632645120000
2255685679780013920000

[1,1,-2,9,-24,130,-720,8505,-35840,412776,
 -3628800,42030450,-479001600,7019298000,
 -82614884352,1886805545625,-20922789888000,
 374426276224000,-6402373705728000,
 134987215801622184,-2379913632645120000,
 55685679780013920000]