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A003975 as a simple table

na(n)
11
23
34
47
55
612
77
815
913
1015
118
1228
1310
1421
1520
1631
1711
1839
1913
2035
2128
2224
2316
2460
2521
2630
2740
2849
2917
3060
3120
3263
3332
3433
3535
3691
3722
3839
3940
4075
4123
4284
4325
4456
4565
4648
4728
48124
4943
5063
5144
5270
5331
54120
5540
56105
5752
5851
5932
60140
6135
6260
6391
64127
6550
6696
6737
6877
6964

[1,3,4,7,5,12,7,15,13,15,8,28,10,21,20,31,11,39,
 13,35,28,24,16,60,21,30,40,49,17,60,20,63,32,33,
 35,91,22,39,40,75,23,84,25,56,65,48,28,124,43,63,
 44,70,31,120,40,105,52,51,32,140,35,60,91,127,50,
 96,37,77,64]