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A013198 as a simple table

na(n)
00
11
20
3-2
412
5-32
672
7152
8-3808
948448
10-333440
11289408
1226461952
13-393649024
144126861312
15-34249082624
16-93963415552
1712871254335488
18-272828216803328
192591959365570560
206130847346393088

[0,1,0,-2,12,-32,72,152,-3808,48448,-333440,
 289408,26461952,-393649024,4126861312,
 -34249082624,-93963415552,12871254335488,
 -272828216803328,2591959365570560,
 6130847346393088]