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A122874 as a simple table

na(n)
07
113
28
312
49
511
610
710
811
99
1012
118
1213
137
1414
156
1615
175
1816
194
2017
213
2218
232
2419
251
2620
270
2821
29-1
3022
31-2
3223
33-3
3424
35-4
3625
37-5
3826
39-6
4027
41-7
4228
43-8
4429
45-9
4630
47-10
4831
49-11
5032
51-12
5233
53-13
5434
55-14
5635
57-15
5836
59-16
6037
61-17
6238
63-18
6439
65-19
6640
67-20
6841
69-21
7042

[7,13,8,12,9,11,10,10,11,9,12,8,13,7,14,6,15,5,16,
 4,17,3,18,2,19,1,20,0,21,-1,22,-2,23,-3,24,-4,25,
 -5,26,-6,27,-7,28,-8,29,-9,30,-10,31,-11,32,-12,
 33,-13,34,-14,35,-15,36,-16,37,-17,38,-18,39,-19,
 40,-20,41,-21,42]