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A073109 as a simple table

na(n)
20
30
4-7
5-35
6295
72065
8-42980
9-42980
101426670
1115693370
12-774856236
13-10073131068
14692669409432
15692669409432
16-63315621131763
17-1076365559239971
18126262920264259779
192398995485020935801
20-351338708777824396629
21-351338708777824396629

[0,0,-7,-35,295,2065,-42980,-42980,1426670,
 15693370,-774856236,-10073131068,692669409432,
 692669409432,-63315621131763,-1076365559239971,
 126262920264259779,2398995485020935801,
 -351338708777824396629,-351338708777824396629]