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A194975 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1215
1312
1413
1514
1616
1720
1821
1917
2018
2119
2222
2326
2427
2528
2623
2724
2825
2929
3033
3134
3235
3336
3430
3531
3632
3737
3841
3945
4042
4143
4244
4338
4439
4540
4646
4750
4854
4955
5051
5152
5253
5347
5448
5549
5656
5760
5864
5965
6066
6161
6262
6363
6457
6558
6659
6767
6871
6975

[1,2,3,4,5,6,7,8,9,10,11,15,12,13,14,16,20,21,17,
 18,19,22,26,27,28,23,24,25,29,33,34,35,36,30,31,
 32,37,41,45,42,43,44,38,39,40,46,50,54,55,51,52,
 53,47,48,49,56,60,64,65,66,61,62,63,57,58,59,67,
 71,75]