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A306807 as a simple table

na(n)
11
22
33
41
55
62
76
83
91
107
115
122
138
146
153
161
179
187
195
202
2110
228
236
243
251
2611
279
287
295
302
3112
3210
338
346
353
361
3713
3811
399
407
415
422
4314
4412
4510
468
476
483
491
5015
5113
5211
539
547
555
562
5716
5814
5912
6010
618
626
633
641
6517
6615
6713
6811
699
707
715
722
7318
7416
7514
7612
7710
788
796
803
811
8219
8317
8415
8513
8611
879
887
895
902
9120
9218
9316
9414
9512
9610
978
986
993
1001

[1,2,3,1,5,2,6,3,1,7,5,2,8,6,3,1,9,7,5,2,10,8,6,3,
 1,11,9,7,5,2,12,10,8,6,3,1,13,11,9,7,5,2,14,12,10,
 8,6,3,1,15,13,11,9,7,5,2,16,14,12,10,8,6,3,1,17,
 15,13,11,9,7,5,2,18,16,14,12,10,8,6,3,1,19,17,15,
 13,11,9,7,5,2,20,18,16,14,12,10,8,6,3,1]