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A009298 as a simple table

na(n)
01
11
20
3-2
48
556
6-216
7-2344
812032
9168640
10-1075328
11-18467712
12140944000
132863703168
14-25464568832
15-597301399296
166065774456832
17161295676067840
18-1842040163078144
19-54752864215838720
20694620312112857088

[1,1,0,-2,8,56,-216,-2344,12032,168640,-1075328,
 -18467712,140944000,2863703168,-25464568832,
 -597301399296,6065774456832,161295676067840,
 -1842040163078144,-54752864215838720,
 694620312112857088]