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A138238 as a simple table

na(n)
00
11
20
39
4-16
5105
6-336
71513
8-5712
923529
10-92752
11373737
12-1489488
135968873
14-23853648
1595458281
16-381745744
171527157737
18-6108281424
1924433824745
20-97733900880
21390938399721
22-1563748006480

[0,1,0,9,-16,105,-336,1513,-5712,23529,-92752,
 373737,-1489488,5968873,-23853648,95458281,
 -381745744,1527157737,-6108281424,24433824745,
 -97733900880,390938399721,-1563748006480]