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A009618 as a simple table

na(n)
00
11
20
3-2
412
5-59
6300
7-1700
810808
9-76835
10604440
11-5201734
1248397140
13-480836407
145029687572
15-54376704304
16590140657200
17-6060696430375
1849142463616368
1925189857279350
20-16700280706496420
21638685917560435181

[0,1,0,-2,12,-59,300,-1700,10808,-76835,604440,
 -5201734,48397140,-480836407,5029687572,
 -54376704304,590140657200,-6060696430375,
 49142463616368,25189857279350,-16700280706496420,
 638685917560435181]