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A271320 as a simple table

na(n)
21
32
44
52
63
75
85
93
103
113
127
132
143
155
166
173
184
194
206
213
223
235
246
253
264
275
289
292
305
314
327
334
344
354
367
372
384
399
407
413
424
433
447
454
463
475
487
493
505
514
527
532
546
556
566
574
583
593
609
614
623
637
648
653
664
674
687
694
704
716
728
732
744
756
767
773
784
794
808
816
824
834
848
854
863
876

[1,2,4,2,3,5,5,3,3,3,7,2,3,5,6,3,4,4,6,3,3,5,6,3,
 4,5,9,2,5,4,7,4,4,4,7,2,4,9,7,3,4,3,7,4,3,5,7,3,5,
 4,7,2,6,6,6,4,3,3,9,4,3,7,8,3,4,4,7,4,4,6,8,2,4,6,
 7,3,4,4,8,6,4,4,8,4,3,6]