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A137721 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
109
1110
1211
1312
1412
1513
1614
1715
1816
1917
2017
2117
2217
2318
2419
2520
2620
2721
2821
2922
3023
3124
3225
3325
3425
3526
3627
3728
3828
3928
4028
4129
4229
4330
4430
4531
4631
4732
4833
4934
5034
5134
5234
5335
5436
5536
5636
5736
5836
5937
6038
6139
6239
6339
6440
6540
6640
6741
6841
6941
7041
7142
7243
7344

[1,2,3,4,5,6,7,8,9,9,10,11,12,12,13,14,15,16,17,
 17,17,17,18,19,20,20,21,21,22,23,24,25,25,25,26,
 27,28,28,28,28,29,29,30,30,31,31,32,33,34,34,34,
 34,35,36,36,36,36,36,37,38,39,39,39,40,40,40,41,
 41,41,41,42,43,44]