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A121405 as a simple table

na(n)
12
23
34
47
58
69
710
811
914
1015
1116
1219
1320
1421
1524
1625
1726
1829
1930
2031
2132
2233
2337
2438
2542
2643
2744
2845
2946
3049
3150
3254
3355
3459
3560
3661
3765
3866
3967
4072
4177
4280
4381
4484
4589
4694
4795
4896
49100
50101
51102
52107
53112
54116
55124
56136
57137
58141
59142
60147
61159

[2,3,4,7,8,9,10,11,14,15,16,19,20,21,24,25,26,29,
 30,31,32,33,37,38,42,43,44,45,46,49,50,54,55,59,
 60,61,65,66,67,72,77,80,81,84,89,94,95,96,100,101,
 102,107,112,116,124,136,137,141,142,147,159]