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A005451 as a simple table

na(n)
11
21
31
44
51
66
71
88
99
1010
111
1212
131
1414
1515
1616
171
1818
191
2020
2121
2222
231
2424
2525
2626
2727
2828
291
3030
311
3232
3333
3434
3535
3636
371
3838
3939
4040
411
4242
431
4444
4545
4646
471
4848
4949
5050
5151
5252
531
5454
5555
5656
5757
5858
591
6060

[1,1,1,4,1,6,1,8,9,10,1,12,1,14,15,16,1,18,1,20,
 21,22,1,24,25,26,27,28,1,30,1,32,33,34,35,36,1,38,
 39,40,1,42,1,44,45,46,1,48,49,50,51,52,1,54,55,56,
 57,58,1,60]