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A323620 as a simple table

na(n)
00
11
20
31
4-4
519
6-108
7719
8-5496
947465
10-457160
114858865
12-56490060
13713165035
14-9715762980
15142069257055
16-2219386098160
1736889108220305
18-650018185589520
1912103669982341025
20-237476572759473300
214896758300881695875
22-105866710959427454300
232394660132226522508975

[0,1,0,1,-4,19,-108,719,-5496,47465,-457160,
 4858865,-56490060,713165035,-9715762980,
 142069257055,-2219386098160,36889108220305,
 -650018185589520,12103669982341025,
 -237476572759473300,4896758300881695875,
 -105866710959427454300,2394660132226522508975]