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A337996 as a simple table

na(n)
01
10
21
30
40
5-4
60
7-2
80
926
100
110
1280
13352
14912
150
1616
170
18-1936
19-11552
20-40368
210
220
23-3904
24-38528
25-176832
26-560896
27-1424960
280
29-272
300
31297296
323150208
3317187888
3465931008
35201796240

[1,0,1,0,0,-4,0,-2,0,26,0,0,80,352,912,0,16,0,
 -1936,-11552,-40368,0,0,-3904,-38528,-176832,
 -560896,-1424960,0,-272,0,297296,3150208,17187888,
 65931008,201796240]