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A227508 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1212
1318
1419
1520
1621
1722
1823
1924
2025
2127
2229
2330
2431
2532
2633
2736
2839
2940
3041
3142
3243
3344
3445
3546
3647
3748
3849
3950
4051
4152
4253
4354
4455
4556
4657
4758
4859
4960
5061
5162
5263
5364
5465
5566
5667
5768
5869
5970
6071
6172
6273
6374
6475
6576
6677
6778

[1,2,3,4,5,6,7,8,9,10,11,12,18,19,20,21,22,23,24,
 25,27,29,30,31,32,33,36,39,40,41,42,43,44,45,46,
 47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,
 63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78]