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A053642 as a simple table

na(n)
11
21
33
41
53
66
77
81
93
106
117
1212
1313
1414
1515
161
173
186
197
2012
2113
2214
2315
2424
2525
2626
2727
2828
2929
3030
3131
321
333
346
357
3612
3713
3814
3915
4024
4125
4226
4327
4428
4529
4630
4731
4848
4949
5050
5151
5252
5353
5454
5555
5656
5757
5858
5959
6060
6161
6262
6363
641

[1,1,3,1,3,6,7,1,3,6,7,12,13,14,15,1,3,6,7,12,13,
 14,15,24,25,26,27,28,29,30,31,1,3,6,7,12,13,14,15,
 24,25,26,27,28,29,30,31,48,49,50,51,52,53,54,55,
 56,57,58,59,60,61,62,63,1]