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A031501 as a simple table

na(n)
01
12
23
33
44
56
64
75
87
99
105
116
128
1310
1412
156
167
179
1812
1914
2016
217
228
2310
2413
2515
2618
2721
288
299
3011
3114
3217
3319
3422
3525
369
3710
3812
3915
4018
4121
4224
4327
4430
4510
4611
4713
4816
4920
5022
5125
5229
5332
5435
5511
5612
5714
5817
5921
6024
6127
6230
6334
6437
6540
6612
6713
6815
6918
7022
7125
7228

[1,2,3,3,4,6,4,5,7,9,5,6,8,10,12,6,7,9,12,14,16,7,
 8,10,13,15,18,21,8,9,11,14,17,19,22,25,9,10,12,15,
 18,21,24,27,30,10,11,13,16,20,22,25,29,32,35,11,
 12,14,17,21,24,27,30,34,37,40,12,13,15,18,22,25,
 28]