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A153516 as a simple table

na(n)
12
23
33
42
514
62
72
825
925
102
112
1233
1392
1433
152
162
1741
18200
19200
2041
212
222
2349
24340
25676
26340
2749
282
292
3057
31512
321616
331616
34512
3557
362
372
3865
39716
403148
415260
423148
43716
4465
452
462
4773
48952
495400
5013256
5113256
525400
53952
5473
552

[2,3,3,2,14,2,2,25,25,2,2,33,92,33,2,2,41,200,200,
 41,2,2,49,340,676,340,49,2,2,57,512,1616,1616,512,
 57,2,2,65,716,3148,5260,3148,716,65,2,2,73,952,
 5400,13256,13256,5400,952,73,2]