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A131987 as a simple table

na(n)
11
22
31
43
54
62
75
81
96
103
117
128
134
149
152
1610
175
1811
191
2012
216
2213
233
2414
257
2615
2716
288
2917
304
3118
329
3319
342
3520
3610
3721
385
3922
4011
4123
421
4324
4412
4525
466
4726
4813
4927
503
5128
5214
5329
547
5530
5615
5731
5832
5916
6033
618
6234
6317
6435
654
6636
6718
6837
699
7038
7119
7239
732
7440
7520
7641
7710
7842
7921
8043

[1,2,1,3,4,2,5,1,6,3,7,8,4,9,2,10,5,11,1,12,6,13,
 3,14,7,15,16,8,17,4,18,9,19,2,20,10,21,5,22,11,23,
 1,24,12,25,6,26,13,27,3,28,14,29,7,30,15,31,32,16,
 33,8,34,17,35,4,36,18,37,9,38,19,39,2,40,20,41,10,
 42,21,43]