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A003981 as a simple table

na(n)
11
23
34
47
56
612
79
815
913
1018
1114
1228
1322
1427
1524
1631
1735
1839
1956
2042
2136
2242
2390
2460
2531
2666
2740
2863
29145
3072
31234
3263
3356
34105
3554
3691
37378
38168
3988
4090
41611
42108
43988
4498
4578
46270
471598
48124
4973
5093
51140
52154
532585
54120
5584
56135
57224
58435
594182
60168
616766
62702

[1,3,4,7,6,12,9,15,13,18,14,28,22,27,24,31,35,39,
 56,42,36,42,90,60,31,66,40,63,145,72,234,63,56,
 105,54,91,378,168,88,90,611,108,988,98,78,270,
 1598,124,73,93,140,154,2585,120,84,135,224,435,
 4182,168,6766,702]