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A123031 as a simple table

na(n)
12
23
33
45
54
65
77
86
96
107
119
128
137
148
1511
1611
1710
189
199
2012
2113
2213
2312
2411
2510
2613
2714
2817
2915
3014
3113
3212
3312
3415
3518
3619
3717
3816
3915
4014
4113
4214
4319
4420
4523
4619
4718
4817
4916
5015
5115
5216
5321
5424
5529
5621
5720
5819
5918
6017
6116
6217
6320
6425
6530
6631
6723
6822
6921
7020
7119
7218
7318
7421
7522

[2,3,3,5,4,5,7,6,6,7,9,8,7,8,11,11,10,9,9,12,13,
 13,12,11,10,13,14,17,15,14,13,12,12,15,18,19,17,
 16,15,14,13,14,19,20,23,19,18,17,16,15,15,16,21,
 24,29,21,20,19,18,17,16,17,20,25,30,31,23,22,21,
 20,19,18,18,21,22]