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A290988 as a simple table

na(n)
21
31
42
51
63
71
84
93
105
113
126
133
147
155
168
175
189
195
2010
217
2211
237
2412
257
2613
279
2814
299
3015
319
3216
3311
3417
3511
3618
3711
3819
3913
4020
4113
4221
4313
4422
4515
4623
4715
4824
4915
5025
5117
5226
5317
5427
5517
5628
5719
5829
5919
6030
6119
6231
6321
6432
6521
6633
6721
6834
6923
7035

[1,1,2,1,3,1,4,3,5,3,6,3,7,5,8,5,9,5,10,7,11,7,12,
 7,13,9,14,9,15,9,16,11,17,11,18,11,19,13,20,13,21,
 13,22,15,23,15,24,15,25,17,26,17,27,17,28,19,29,
 19,30,19,31,21,32,21,33,21,34,23,35]