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A049821 as a simple table

na(n)
33
44
55
66
78
89
912
1012
1114
1215
1315
1417
1518
1618
1720
1820
1922
2023
2123
2225
2325
2427
2528
2628
2735
2828
2929
3035
3133
3238
3335
3441
3537
3637
3739
3841
3946
4048
4143
4251
4345
4453
4548
4648
4750
4850
4958
5052
5160
5254
5356
5462
5556
5665
5759
5861
5961
6063
6170
6264
6366
6471
6566
6673
6769
6877
6971
7079
7173
7283
7374
7476
7578

[3,4,5,6,8,9,12,12,14,15,15,17,18,18,20,20,22,23,
 23,25,25,27,28,28,35,28,29,35,33,38,35,41,37,37,
 39,41,46,48,43,51,45,53,48,48,50,50,58,52,60,54,
 56,62,56,65,59,61,61,63,70,64,66,71,66,73,69,77,
 71,79,73,83,74,76,78]