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A117571 as a simple table

na(n)
01
11
23
34
44
56
67
77
89
910
1010
1112
1213
1313
1415
1516
1616
1718
1819
1919
2021
2122
2222
2324
2425
2525
2627
2728
2828
2930
3031
3131
3233
3334
3434
3536
3637
3737
3839
3940
4040
4142
4243
4343
4445
4546
4646
4748
4849
4949
5051
5152
5252
5354
5455
5555
5657
5758
5858
5960
6061
6161
6263
6364
6464
6566
6667
6767
6869
6970
7070
7172

[1,1,3,4,4,6,7,7,9,10,10,12,13,13,15,16,16,18,19,
 19,21,22,22,24,25,25,27,28,28,30,31,31,33,34,34,
 36,37,37,39,40,40,42,43,43,45,46,46,48,49,49,51,
 52,52,54,55,55,57,58,58,60,61,61,63,64,64,66,67,
 67,69,70,70,72]