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A111681 as a simple table

na(n)
11
22
35
44
513
66
731
88
9121
1026
1161
1212
13109
1458
15106
1616
17181
1892
19277
20244
21155
22218
23397
2424
251849
26302
2712167
28423
29547
3030
31733
3232
33393
34505
35626
3636
37947
38749
39886
40488
411213
42286
431499
44711
451143
461027
471831
4848
4927889
501719
511195
522308
532207
541576

[1,2,5,4,13,6,31,8,121,26,61,12,109,58,106,16,181,
 92,277,244,155,218,397,24,1849,302,12167,423,547,
 30,733,32,393,505,626,36,947,749,886,488,1213,286,
 1499,711,1143,1027,1831,48,27889,1719,1195,2308,
 2207,1576]