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A120206 as a simple table

na(n)
15
26
36
47
58
69
710
811
912
1013
1115
1216
1318
1420
1522
1625
1728
1831
1934
2038
2142
2247
2352
2458
2564
2671
2779
2888
2998
30109
31121
32134
33149
34166
35184
36205
37227
38253
39281
40312

[5,6,6,7,8,9,10,11,12,13,15,16,18,20,22,25,28,31,
 34,38,42,47,52,58,64,71,79,88,98,109,121,134,149,
 166,184,205,227,253,281,312]