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A047309 as a simple table

na(n)
11
23
34
45
56
68
710
811
912
1013
1115
1217
1318
1419
1520
1622
1724
1825
1926
2027
2129
2231
2332
2433
2534
2636
2738
2839
2940
3041
3143
3245
3346
3447
3548
3650
3752
3853
3954
4055
4157
4259
4360
4461
4562
4664
4766
4867
4968
5069
5171
5273
5374
5475
5576
5678

[1,3,4,5,6,8,10,11,12,13,15,17,18,19,20,22,24,25,
 26,27,29,31,32,33,34,36,38,39,40,41,43,45,46,47,
 48,50,52,53,54,55,57,59,60,61,62,64,66,67,68,69,
 71,73,74,75,76,78]