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A081304 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
3022
3123
3224
3324
3424
3525
3626
3727
3827
3927
4027
4128
4228
4329
4429
4530
4630
4731
4832
4933
5033
5133
5233
5334
5435
5535
5635
5735
5835
5936
6036
6137
6237
6337
6438
6538
6638
6739
6839
6939
7039
7140
7241
7342

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