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A063987 as a simple table

na(n)
11
21
31
44
51
62
74
81
93
104
115
129
131
143
154
169
1710
1812
191
202
214
228
239
2413
2515
2616
271
284
295
306
317
329
3311
3416
3517
361
372
383
394
406
418
429
4312
4413
4516
4618
471
484
495
506
517
529
5313
5416
5520
5622
5723
5824
5925
6028
611
622
634
645
657
668
679
6810
6914
7016
7118
7219
7320
7425
7528
761
773
784
797
809
8110
8211
8312
8416
8521
8625

[1,1,1,4,1,2,4,1,3,4,5,9,1,3,4,9,10,12,1,2,4,8,9,
 13,15,16,1,4,5,6,7,9,11,16,17,1,2,3,4,6,8,9,12,13,
 16,18,1,4,5,6,7,9,13,16,20,22,23,24,25,28,1,2,4,5,
 7,8,9,10,14,16,18,19,20,25,28,1,3,4,7,9,10,11,12,
 16,21,25]