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A129675 as a simple table

na(n)
13
22
31
45
57
64
76
89
915
108
1111
1210
1312
1414
1513
1617
1721
1816
1919
2018
2120
2223
2327
2422
2524
2626
2725
2829
2931
3028
3130
3233
3337
3432
3535
3634
3736
3839
3943
4038
4140
4242
4341
4445
4551
4644
4747
4846
4948
5050
5149
5253
5355
5452
5554
5657
5763
5856
5959
6058
6160
6262
6361
6465
6569
6664
6767
6866
6968
7071
7175
7270

[3,2,1,5,7,4,6,9,15,8,11,10,12,14,13,17,21,16,19,
 18,20,23,27,22,24,26,25,29,31,28,30,33,37,32,35,
 34,36,39,43,38,40,42,41,45,51,44,47,46,48,50,49,
 53,55,52,54,57,63,56,59,58,60,62,61,65,69,64,67,
 66,68,71,75,70]