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A331991 as a simple table

na(n)
11
21
31
41
52
61
73
81
93
102
114
121
135
141
155
164
174
181
197
201
217
225
236
241
257
263
277
285
297
301
3113
321
338
346
356
366
3710
381
399
407
419
421
4315
441
4512
4612
478
481
4912
504
5113
526
5311
541
5515
567
5713
589
599
601
6117
621
6315
6415
659
668
6721
681
6913
708
7116
721
7318
741
7512
7616
7711
788
7921
801

[1,1,1,1,2,1,3,1,3,2,4,1,5,1,5,4,4,1,7,1,7,5,6,1,
 7,3,7,5,7,1,13,1,8,6,6,6,10,1,9,7,9,1,15,1,12,12,
 8,1,12,4,13,6,11,1,15,7,13,9,9,1,17,1,15,15,9,8,
 21,1,13,8,16,1,18,1,12,16,11,8,21,1]