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A025501 as a simple table

na(n)
01
12
23
35
46
57
68
711
812
912
1013
1118
1216
1315
1419
1518
1620
1720
1823
1921
2023
2128
2228
2333
2425
2533
2637
2738
2835
2931
3041
3146
3238
3350
3445
3549
3649
3744
3845
3952
4050
4152
4258
4358
4453
4554
4654
4755
4867
4957
5065
5167
5266
5374
5477
5580
5676
5779
5876
5972
6074
6183
6279
6377
6488
6583
6678
6787
6876
6988
7087
7194
7297

[1,2,3,5,6,7,8,11,12,12,13,18,16,15,19,18,20,20,
 23,21,23,28,28,33,25,33,37,38,35,31,41,46,38,50,
 45,49,49,44,45,52,50,52,58,58,53,54,54,55,67,57,
 65,67,66,74,77,80,76,79,76,72,74,83,79,77,88,83,
 78,87,76,88,87,94,97]