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A121758 as a simple table

na(n)
1-1
22
3-3
44
5-5
66
7-7
88
9-9
10-10
11-11
12-8
13-13
14-6
15-15
16-4
17-17
18-2
19-19
2020
2119
2222
2317
2424
2515
2626
2713
2828
2911
30-30
31-31
32-28
33-33
34-26
35-35
36-24
37-37
38-22
39-39
4040
4139
4242
4337
4444
4535
4646
4733
4848
4931
50-50
51-51
52-48
53-53
54-46
55-55
56-44
57-57
58-42
59-59
6060
6159
6262
6357
6464
6555
6666
6753
6868
6951
70-70
71-71
72-68
73-73
74-66
75-75
76-64

[-1,2,-3,4,-5,6,-7,8,-9,-10,-11,-8,-13,-6,-15,-4,
 -17,-2,-19,20,19,22,17,24,15,26,13,28,11,-30,-31,
 -28,-33,-26,-35,-24,-37,-22,-39,40,39,42,37,44,35,
 46,33,48,31,-50,-51,-48,-53,-46,-55,-44,-57,-42,
 -59,60,59,62,57,64,55,66,53,68,51,-70,-71,-68,-73,
 -66,-75,-64]