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A251768 as a simple table

na(n)
17
21
310
41
510
61
710
81
910
101
1110
124
131
148
151
1610
171
1810
191
2010
211
2210
231
2410
251
2610
272
2810
291
3010
311
3210
331
3410
351
3610
371
3810
391
4010
412
4210
431
4410
451
4610
471
4810
491
5010
511
5210
531
5410
553
561
578
581
5910
601
6110
621
6310
641
6510
661
6710
681
6910
702
7110
721
7310
741
7510

[7,1,10,1,10,1,10,1,10,1,10,4,1,8,1,10,1,10,1,10,
 1,10,1,10,1,10,2,10,1,10,1,10,1,10,1,10,1,10,1,10,
 2,10,1,10,1,10,1,10,1,10,1,10,1,10,3,1,8,1,10,1,
 10,1,10,1,10,1,10,1,10,2,10,1,10,1,10]