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A247964 as a simple table

na(n)
00
11
22
34
45
56
68
79
811
912
1013
1115
1216
1318
1419
1520
1622
1723
1825
1926
2027
2129
2230
2332
2433
2534
2636
2737
2839
2940
3041
3143
3244
3346
3447
3548
3650
3751
3853
3954
4055
4157
4258
4360
4461
4562
4664
4765
4866
4968
5069
5171
5272
5373
5475
5576
5678
5779
5880
5982
6083
6185
6286
6387
6489
6590
6692
6793

[0,1,2,4,5,6,8,9,11,12,13,15,16,18,19,20,22,23,25,
 26,27,29,30,32,33,34,36,37,39,40,41,43,44,46,47,
 48,50,51,53,54,55,57,58,60,61,62,64,65,66,68,69,
 71,72,73,75,76,78,79,80,82,83,85,86,87,89,90,92,
 93]