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A118287 as a simple table

na(n)
11
22
31
43
56
65
76
810
99
1010
118
1217
1316
1417
1515
1612
1713
1812
1928
2027
2128
2226
2323
2424
2523
2619
2720
2819
2921
3046
3145
3246
3344
3441
3542
3641
3737
3838
3937
4039
4130
4231
4330
4432
4535
4634
4735
4875
4974
5075
5173
5270
5371
5470
5566
5667
5766
5868
5959
6060
6159
6261
6364
6463
6564
6648
6749
6848
6950
7053
7152
7253

[1,2,1,3,6,5,6,10,9,10,8,17,16,17,15,12,13,12,28,
 27,28,26,23,24,23,19,20,19,21,46,45,46,44,41,42,
 41,37,38,37,39,30,31,30,32,35,34,35,75,74,75,73,
 70,71,70,66,67,66,68,59,60,59,61,64,63,64,48,49,
 48,50,53,52,53]