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A239286 as a simple table

na(n)
01
11
20
3-2
41
53
6-5
71
86
9-8
101
119
12-11
131
1412
15-14
161
1715
18-17
191
2018
21-20
221
2321
24-23
251
2624
27-26
281
2927
30-29
311
3230
33-32
341
3533
36-35
371
3836
39-38
401
4139
42-41
431
4442
45-44
461
4745
48-47
491
5048
51-50
521
5351
54-53
551
5654
57-56
581
5957
60-59
611
6260
63-62
641
6563
66-65

[1,1,0,-2,1,3,-5,1,6,-8,1,9,-11,1,12,-14,1,15,-17,
 1,18,-20,1,21,-23,1,24,-26,1,27,-29,1,30,-32,1,33,
 -35,1,36,-38,1,39,-41,1,42,-44,1,45,-47,1,48,-50,
 1,51,-53,1,54,-56,1,57,-59,1,60,-62,1,63,-65]