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A047839 as a simple table

na(n)
12
24
35
46
58
69
710
812
913
1014
1115
1216
1318
1419
1520
1621
1722
1824
1925
2026
2127
2228
2329
2430
2532
2633
2734
2835
2936
3037
3138
3240
3341
3442
3543
3644
3745
3846
3947
4048
4150
4251
4352
4453
4554
4655
4756
4857
4958
5060
5161
5262
5363
5464
5565
5666
5767
5868
5969
6070
6172
6273
6374
6475
6576
6677
6778
6879

[2,4,5,6,8,9,10,12,13,14,15,16,18,19,20,21,22,24,
 25,26,27,28,29,30,32,33,34,35,36,37,38,40,41,42,
 43,44,45,46,47,48,50,51,52,53,54,55,56,57,58,60,
 61,62,63,64,65,66,67,68,69,70,72,73,74,75,76,77,
 78,79]