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A257702 as a simple table

na(n)
12
21
33
43
57
62
712
84
96
104
116
128
1312
143
1511
1613
1715
185
197
205
217
227
2311
245
259
267
279
289
2911
3013
3117
324
3310
3412
3514
3614
3716
3814
3918
4016
4124
426
438
448
4510
466
4710
488
4916
508
5110
5212
5314
546
558
5610
5716
5810
5914
608
6110
6210
6312
6410
6514
6612
6718
6814
6916
7018
7120
725
739

[2,1,3,3,7,2,12,4,6,4,6,8,12,3,11,13,15,5,7,5,7,7,
 11,5,9,7,9,9,11,13,17,4,10,12,14,14,16,14,18,16,
 24,6,8,8,10,6,10,8,16,8,10,12,14,6,8,10,16,10,14,
 8,10,10,12,10,14,12,18,14,16,18,20,5,9]