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A065261 as a simple table

na(n)
11
21
31
42
55
63
72
84
99
105
113
126
1313
147
154
168
1717
189
195
2010
2121
2211
236
2412
2525
2613
277
2814
2929
3015
318
3216
3333
3417
359
3618
3737
3819
3910
4020
4141
4221
4311
4422
4545
4623
4712
4824
4949
5025
5113
5226
5353
5427
5514
5628
5757
5829
5915
6030
6161
6231
6316
6432
6565
6633
6717
6834
6969
7035
7118
7236
7373
7437
7519
7638

[1,1,1,2,5,3,2,4,9,5,3,6,13,7,4,8,17,9,5,10,21,11,
 6,12,25,13,7,14,29,15,8,16,33,17,9,18,37,19,10,20,
 41,21,11,22,45,23,12,24,49,25,13,26,53,27,14,28,
 57,29,15,30,61,31,16,32,65,33,17,34,69,35,18,36,
 73,37,19,38]