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A143681 as a simple table

na(n)
01
11
21
31
49
51
61
717
817
91
101
1125
1297
1325
141
151
1633
17241
18241
1933
201
211
2241
23449
241161
25449
2641
271
281
2949
30721
313297
323297
33721
3449
351
361
3757
381057
397161
4014721
417161
421057
4357
441
451
4665
471457
4813265

[1,1,1,1,9,1,1,17,17,1,1,25,97,25,1,1,33,241,241,
 33,1,1,41,449,1161,449,41,1,1,49,721,3297,3297,
 721,49,1,1,57,1057,7161,14721,7161,1057,57,1,1,65,
 1457,13265]