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A007609 as a simple table

na(n)
11
23
34
46
57
68
712
812
913
1014
1115
1218
1318
1420
1524
1624
1724
1828
1930
2031
2131
2232
2332
2436
2538
2639
2740
2842
2942
3042
3144
3248
3348
3448
3554
3654
3756
3856
3957
4060
4160
4260
4362
4463
4568
4672
4772
4872
4972
5072
5174
5278
5380
5480
5584
5684
5784
5890
5990
6090
6191
6293
6396
6496
6596
6696
6798
6898

[1,3,4,6,7,8,12,12,13,14,15,18,18,20,24,24,24,28,
 30,31,31,32,32,36,38,39,40,42,42,42,44,48,48,48,
 54,54,56,56,57,60,60,60,62,63,68,72,72,72,72,72,
 74,78,80,80,84,84,84,90,90,90,91,93,96,96,96,96,
 98,98]