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A047308 as a simple table

na(n)
10
23
34
45
56
67
710
811
912
1013
1114
1217
1318
1419
1520
1621
1724
1825
1926
2027
2128
2231
2332
2433
2534
2635
2738
2839
2940
3041
3142
3245
3346
3447
3548
3649
3752
3853
3954
4055
4156
4259
4360
4461
4562
4663
4766
4867
4968
5069
5170
5273
5374
5475
5576
5677

[0,3,4,5,6,7,10,11,12,13,14,17,18,19,20,21,24,25,
 26,27,28,31,32,33,34,35,38,39,40,41,42,45,46,47,
 48,49,52,53,54,55,56,59,60,61,62,63,66,67,68,69,
 70,73,74,75,76,77]