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A309636 as a simple table

na(n)
13
21
34
42
55
63
76
84
97
1010
118
126
139
147
1510
1613
176
1814
1912
2010
2118
226
2314
2417
2510
2623
2711
2814
2922
3010
3128
3216
3314
3427
3510
3633
3716
3814
3932
4010
4138
4216
4319
4437
4510
4643
4716
4824
4942
5010
5148
5216
5324
5447
5510
5653
5716
5824
5952
6010
6158
6216
6324
6457
6510
6663
6721
6824
6962
7010
7168
7226
7324
7467
7510

[3,1,4,2,5,3,6,4,7,10,8,6,9,7,10,13,6,14,12,10,18,
 6,14,17,10,23,11,14,22,10,28,16,14,27,10,33,16,14,
 32,10,38,16,19,37,10,43,16,24,42,10,48,16,24,47,
 10,53,16,24,52,10,58,16,24,57,10,63,21,24,62,10,
 68,26,24,67,10]