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A260218 as a simple table

na(n)
12
23
32
45
52
63
72
817
92
103
112
125
132
143
152
16257
172
183
192
205
212
223
232
2417
252
263
272
285
292
303
312
3265537
332
343
352
365
372
383
392
4017
412
423
432
445
452
463
472
4897
492
503
512
525
532
543
552
5617
572
583
592
605
612
623
632
64641
652
663
672
685
692
703
712
7217
732
743
752
765
772
783

[2,3,2,5,2,3,2,17,2,3,2,5,2,3,2,257,2,3,2,5,2,3,2,
 17,2,3,2,5,2,3,2,65537,2,3,2,5,2,3,2,17,2,3,2,5,2,
 3,2,97,2,3,2,5,2,3,2,17,2,3,2,5,2,3,2,641,2,3,2,5,
 2,3,2,17,2,3,2,5,2,3]