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A278961 as a simple table

na(n)
11
21
31
42
51
62
73
81
92
103
114
121
135
141
152
163
174
185
196
201
212
223
235
246
257
261
272
283
294
305
316
327
338
341
353
364
376
387
399
401
412
423
434
445
456
467
478
489
4910
501
512
525
536
547
5510
5611
571
582
593
604
615
626
637
648
659
6610
6711
6812
691
703
715
729
7311
7413
751
762
774
787
798
8011
8113
8214
831
842

[1,1,1,2,1,2,3,1,2,3,4,1,5,1,2,3,4,5,6,1,2,3,5,6,
 7,1,2,3,4,5,6,7,8,1,3,4,6,7,9,1,2,3,4,5,6,7,8,9,
 10,1,2,5,6,7,10,11,1,2,3,4,5,6,7,8,9,10,11,12,1,3,
 5,9,11,13,1,2,4,7,8,11,13,14,1,2]