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A247987 as a simple table

na(n)
11
23
34
46
57
68
710
811
912
1014
1115
1217
1318
1419
1521
1622
1724
1825
1926
2028
2129
2231
2332
2433
2535
2636
2738
2839
2940
3042
3143
3245
3346
3447
3549
3650
3751
3853
3954
4056
4157
4258
4360
4461
4563
4664
4765
4867
4968
5070
5171
5272
5374
5475
5577
5678
5779
5881
5982
6083
6185
6286
6388
6489
6590
6692

[1,3,4,6,7,8,10,11,12,14,15,17,18,19,21,22,24,25,
 26,28,29,31,32,33,35,36,38,39,40,42,43,45,46,47,
 49,50,51,53,54,56,57,58,60,61,63,64,65,67,68,70,
 71,72,74,75,77,78,79,81,82,83,85,86,88,89,90,92]