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A009296 as a simple table

na(n)
01
11
20
3-2
4-4
5-4
624
7176
8272
9-1712
10-14528
11-66912
12181312
134737344
1420265088
15-53926656
16-1771263744
17-18559434496
184388386816
191869838374400
2016325400792064
2135429689535488
22-1796402984175616
23-36301265658269696

[1,1,0,-2,-4,-4,24,176,272,-1712,-14528,-66912,
 181312,4737344,20265088,-53926656,-1771263744,
 -18559434496,4388386816,1869838374400,
 16325400792064,35429689535488,-1796402984175616,
 -36301265658269696]