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A121600 as a simple table

na(n)
11
21
32
42
54
65
76
83
96
108
1110
128
1312
1413
1512
165
1716
1812
1918
2016
2120
2221
2322
2415
2519
2624
2716
2826
2928
3024
3130
329
3331
3433
3532
3621
3736
3836
3936
4033
4140
4238
4342
4440
4536
4645
4746
4825
4944
5039
5150
5248
5352
5429
5550
5651
5754
5856
5958
6047
6160
6260
6357
6421
6560
6661
6766
6866
6967
7063
7170
7237
7372
7472

[1,1,2,2,4,5,6,3,6,8,10,8,12,13,12,5,16,12,18,16,
 20,21,22,15,19,24,16,26,28,24,30,9,31,33,32,21,36,
 36,36,33,40,38,42,40,36,45,46,25,44,39,50,48,52,
 29,50,51,54,56,58,47,60,60,57,21,60,61,66,66,67,
 63,70,37,72,72]