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A372471 as a simple table

na(n)
12
21
32
41
53
61
72
83
91
102
114
121
133
144
151
165
171
182
195
201
212
223
235
241
253
264
275
281
292
303
314
325
331
343
356
361
374
386
391
402
414
426
431
442
453
464
476
481
493
505
516
521
532
544
555
566
571
583
594
605
616
621
632
647
651
662
673
687
691
704
717
721
732
743
754
767
771
782
795
807
811
824
835
847
851
866
877

[2,1,2,1,3,1,2,3,1,2,4,1,3,4,1,5,1,2,5,1,2,3,5,1,
 3,4,5,1,2,3,4,5,1,3,6,1,4,6,1,2,4,6,1,2,3,4,6,1,3,
 5,6,1,2,4,5,6,1,3,4,5,6,1,2,7,1,2,3,7,1,4,7,1,2,3,
 4,7,1,2,5,7,1,4,5,7,1,6,7]