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A129507 as a simple table

na(n)
00
10
20
34
4-4
50
68
7-16
812
920
10-80
11116
12-4
13-376
14884
15-764
16-1308
175816
18-9128
19648
2032008
21-79608
2273100
23122020
24-574044
25937456
26-97748
27-3366892
288659492
29-8276056
30-13301640
3165261640
32-109501476
3314857740
34395316672
35-1042421076
361028105156
371582877768
38-8052459580

[0,0,0,4,-4,0,8,-16,12,20,-80,116,-4,-376,884,
 -764,-1308,5816,-9128,648,32008,-79608,73100,
 122020,-574044,937456,-97748,-3366892,8659492,
 -8276056,-13301640,65261640,-109501476,14857740,
 395316672,-1042421076,1028105156,1582877768,
 -8052459580]