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A059399 as a simple table

na(n)
11
23
32
46
54
65
710
87
99
108
1115
1211
1314
1412
1513
1621
1716
1820
1917
2019
2118
2228
2322
2427
2523
2626
2724
2825
2936
3029
3135
3230
3334
3431
3533
3632
3745
3837
3944
4038
4143
4239
4342
4440
4541
4655
4746
4854
4947
5053
5148
5252
5349
5451
5550
5666
5756
5865
5957
6064
6158
6263
6359
6462
6560
6661

[1,3,2,6,4,5,10,7,9,8,15,11,14,12,13,21,16,20,17,
 19,18,28,22,27,23,26,24,25,36,29,35,30,34,31,33,
 32,45,37,44,38,43,39,42,40,41,55,46,54,47,53,48,
 52,49,51,50,66,56,65,57,64,58,63,59,62,60,61]