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A309650 as a simple table

na(n)
13
21
34
42
55
63
76
89
97
105
113
1211
1314
147
155
168
1716
1819
197
205
218
2221
2324
2412
255
268
2726
2829
2912
305
318
3231
3334
3412
355
3613
3736
3839
3912
405
4113
4241
4344
4412
455
4613
4746
4849
4917
505
5113
5251
5354
5417
555
5613
5756
5859
5917
605
6113
6261
6364
6417
655
6618
6766
6869
6917
705
7118
7271
7374
7417
755
7618
7776
7879
7917
805
8118
8281
8384
8422
855

[3,1,4,2,5,3,6,9,7,5,3,11,14,7,5,8,16,19,7,5,8,21,
 24,12,5,8,26,29,12,5,8,31,34,12,5,13,36,39,12,5,
 13,41,44,12,5,13,46,49,17,5,13,51,54,17,5,13,56,
 59,17,5,13,61,64,17,5,18,66,69,17,5,18,71,74,17,5,
 18,76,79,17,5,18,81,84,22,5]