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A181983 as a simple table

na(n)
00
11
2-2
33
4-4
55
6-6
77
8-8
99
10-10
1111
12-12
1313
14-14
1515
16-16
1717
18-18
1919
20-20
2121
22-22
2323
24-24
2525
26-26
2727
28-28
2929
30-30
3131
32-32
3333
34-34
3535
36-36
3737
38-38
3939
40-40
4141
42-42
4343
44-44
4545
46-46
4747
48-48
4949
50-50
5151
52-52
5353
54-54
5555
56-56
5757
58-58
5959

[0,1,-2,3,-4,5,-6,7,-8,9,-10,11,-12,13,-14,15,-16,
 17,-18,19,-20,21,-22,23,-24,25,-26,27,-28,29,-30,
 31,-32,33,-34,35,-36,37,-38,39,-40,41,-42,43,-44,
 45,-46,47,-48,49,-50,51,-52,53,-54,55,-56,57,-58,
 59]