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A291480 as a simple table

na(n)
149
249
349
436
545
649
77
88
99
1010
1111
1212
1313
147
1515
168
1717
189
1919
2010
217
2211
2323
248
2525
2613
279
287
2929
3010
3131
328
3311
3417
357
369
3737
3819
3913
408
4141
427
4343
4411
459
4623
4747
488
497
5010
5117
5213
5349
549
5511
567
5719
5829
5949
6010
6149
6231
637
648
6513
6611
6749
6817
6923
707

[49,49,49,36,45,49,7,8,9,10,11,12,13,7,15,8,17,9,
 19,10,7,11,23,8,25,13,9,7,29,10,31,8,11,17,7,9,37,
 19,13,8,41,7,43,11,9,23,47,8,7,10,17,13,49,9,11,7,
 19,29,49,10,49,31,7,8,13,11,49,17,23,7]