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A009655 as a simple table

na(n)
00
10
22
3-6
422
5-100
6788
7-8568
8103416
9-1307808
1017722512
11-264361680
124373968080
13-79413478560
141558387903200
15-32713320769920
16731007454396800
17-17347090012492800
18436154519763744000
19-11585396062022112000

[0,0,2,-6,22,-100,788,-8568,103416,-1307808,
 17722512,-264361680,4373968080,-79413478560,
 1558387903200,-32713320769920,731007454396800,
 -17347090012492800,436154519763744000,
 -11585396062022112000]