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A007947 as a simple table

na(n)
11
22
33
42
55
66
77
82
93
1010
1111
126
1313
1414
1515
162
1717
186
1919
2010
2121
2222
2323
246
255
2626
273
2814
2929
3030
3131
322
3333
3434
3535
366
3737
3838
3939
4010
4141
4242
4343
4422
4515
4646
4747
486
497
5010
5151
5226
5353
546
5555
5614
5757
5858
5959
6030
6161
6262
6321
642
6565
6666
6767
6834
6969
7070
7171
726
7373
7474
7515
7638
7777
7878

[1,2,3,2,5,6,7,2,3,10,11,6,13,14,15,2,17,6,19,10,
 21,22,23,6,5,26,3,14,29,30,31,2,33,34,35,6,37,38,
 39,10,41,42,43,22,15,46,47,6,7,10,51,26,53,6,55,
 14,57,58,59,30,61,62,21,2,65,66,67,34,69,70,71,6,
 73,74,15,38,77,78]