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A246778 as a simple table

na(n)
12
22
33
44
56
66
78
88
99
1011
1111
1212
1313
1413
1513
1614
1715
1815
1916
2016
2116
2217
2317
2418
2519
2619
2719
2819
2919
3019
3121
3221
3322
3421
3522
3622
3722
3823
3923
4023
4124
4223
4324
4424
4524
4624
4725
4826
4926
5026
5126
5226
5326
5427
5527
5627
5727
5827
5927
6027
6127
6228
6329
6429
6528
6628
6729
6830
6930
7030

[2,2,3,4,6,6,8,8,9,11,11,12,13,13,13,14,15,15,16,
 16,16,17,17,18,19,19,19,19,19,19,21,21,22,21,22,
 22,22,23,23,23,24,23,24,24,24,24,25,26,26,26,26,
 26,26,27,27,27,27,27,27,27,27,28,29,29,28,28,29,
 30,30,30]