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A098181 as a simple table

na(n)
01
13
24
34
45
57
68
78
89
911
1012
1112
1213
1315
1416
1516
1617
1719
1820
1920
2021
2123
2224
2324
2425
2527
2628
2728
2829
2931
3032
3132
3233
3335
3436
3536
3637
3739
3840
3940
4041
4143
4244
4344
4445
4547
4648
4748
4849
4951
5052
5152
5253
5355
5456
5556
5657
5759
5860
5960
6061
6163
6264
6364
6465
6567
6668
6768
6869
6971
7072
7172

[1,3,4,4,5,7,8,8,9,11,12,12,13,15,16,16,17,19,20,
 20,21,23,24,24,25,27,28,28,29,31,32,32,33,35,36,
 36,37,39,40,40,41,43,44,44,45,47,48,48,49,51,52,
 52,53,55,56,56,57,59,60,60,61,63,64,64,65,67,68,
 68,69,71,72,72]