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A055615 as a simple table

na(n)
11
2-2
3-3
40
5-5
66
7-7
80
90
1010
11-11
120
13-13
1414
1515
160
17-17
180
19-19
200
2121
2222
23-23
240
250
2626
270
280
29-29
30-30
31-31
320
3333
3434
3535
360
37-37
3838
3939
400
41-41
42-42
43-43
440
450
4646
47-47
480
490
500
5151
520
53-53
540
5555
560
5757
5858
59-59
600
61-61
6262
630
640
6565
66-66
67-67
680
6969
70-70
71-71
720

[1,-2,-3,0,-5,6,-7,0,0,10,-11,0,-13,14,15,0,-17,0,
 -19,0,21,22,-23,0,0,26,0,0,-29,-30,-31,0,33,34,35,
 0,-37,38,39,0,-41,-42,-43,0,0,46,-47,0,0,0,51,0,
 -53,0,55,0,57,58,-59,0,-61,62,0,0,65,-66,-67,0,69,
 -70,-71,0]