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A138371 as a simple table

na(n)
10
21
32
45
58
67
710
811
910
1012
1115
1217
1317
1417
1520
1621
1722
1823
1925
2026
2128
2230
2329
2430
2531
2631
2732
2832
2934
3035
3135
3236
3336
3438
3540
3640
3742
3842
3942
4043
4144
4243
4345
4446
4547
4647
4749
4852
4951
5052
5154
5254
5355
5457
5559
5659
5760
5860
5960
6061
6161
6262
6362
6464
6564
6666
6767
6869
6971
7073
7174

[0,1,2,5,8,7,10,11,10,12,15,17,17,17,20,21,22,23,
 25,26,28,30,29,30,31,31,32,32,34,35,35,36,36,38,
 40,40,42,42,42,43,44,43,45,46,47,47,49,52,51,52,
 54,54,55,57,59,59,60,60,60,61,61,62,62,64,64,66,
 67,69,71,73,74]