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A138369 as a simple table

na(n)
20
32
42
53
64
74
86
96
107
118
1210
1312
1413
1514
1614
1716
1817
1918
2019
2119
2223
2325
2426
2528
2627
2729
2831
2931
3033
3135
3237
3338
3438
3539
3640
3741
3841
3942
4042
4145
4245
4348
4450
4551
4651
4752
4854
4954
5055
5156
5257
5357
5461
5565
5666
5767
5868
5969
6070
6171
6271
6372
6473
6572
6675
6775
6876
6977
7077
7178
7279
7380
7481
7581
7683

[0,2,2,3,4,4,6,6,7,8,10,12,13,14,14,16,17,18,19,
 19,23,25,26,28,27,29,31,31,33,35,37,38,38,39,40,
 41,41,42,42,45,45,48,50,51,51,52,54,54,55,56,57,
 57,61,65,66,67,68,69,70,71,71,72,73,72,75,75,76,
 77,77,78,79,80,81,81,83]