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A129994 as a simple table

na(n)
01
12
21
32
44
51
62
76
86
91
102
118
1212
138
141
152
1610
1720
1820
1910
201
212
2212
2330
2440
2530
2612
271
282
2914
3042
3170
3270
3342
3414
351
362
3716
3856
39112
40140
41112
4256
4316
441
452
4618
4772
48168
49252
50252
51168
5272
5318
541

[1,2,1,2,4,1,2,6,6,1,2,8,12,8,1,2,10,20,20,10,1,2,
 12,30,40,30,12,1,2,14,42,70,70,42,14,1,2,16,56,
 112,140,112,56,16,1,2,18,72,168,252,252,168,72,18,
 1]