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A147966 as a simple table

na(n)
11
23
34
47
56
69
78
811
914
1011
1116
1215
1314
1417
1520
1621
1718
1823
1922
2021
2126
2225
2328
2431
2528
2627
2730
2829
2932
3043
3134
3235
3334
3443
3536
3641
3742
3841
3944
4045
4142
4251
4344
4447
4546
4657
4758
4851
4950
5053
5156
5253
5362
5459
5560
5661
5758
5863
5962
6061

[1,3,4,7,6,9,8,11,14,11,16,15,14,17,20,21,18,23,
 22,21,26,25,28,31,28,27,30,29,32,43,34,35,34,43,
 36,41,42,41,44,45,42,51,44,47,46,57,58,51,50,53,
 56,53,62,59,60,61,58,63,62,61]