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A121857 as a simple table

na(n)
00
13
24
35
46
57
67
78
88
99
109
1110
1210
1310
1411
1511
1611
1712
1812
1912
2013
2113
2213
2314
2414
2514
2614
2715
2815
2915
3015
3116
3216
3316
3416
3517
3617
3717
3817
3917
4018
4118
4218
4318
4419
4519
4619
4719
4819
4920
5020
5120
5220
5320
5420
5521
5621
5721
5821
5921
6022
6122
6222
6322
6422
6522
6623
6723
6823
6923
7023
7123
7224

[0,3,4,5,6,7,7,8,8,9,9,10,10,10,11,11,11,12,12,12,
 13,13,13,14,14,14,14,15,15,15,15,16,16,16,16,17,
 17,17,17,17,18,18,18,18,19,19,19,19,19,20,20,20,
 20,20,20,21,21,21,21,21,22,22,22,22,22,22,23,23,
 23,23,23,23,24]