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A181572 as a simple table

na(n)
12
21
31
42
53
63
74
82
93
104
113
123
133
145
155
163
172
185
194
204
214
223
232
243
255
263
274
284
295
305
314
323
333
344
354
363
375
385
394
409
413
426
436
445
454
466
473
484
495
504
513
525
535
544
559
562
575
584
594
606
617
624
633
646
657
664
677
684
696
705
714
724
737
747
754
764
775
786
798
806
813
823
836
843
859
865
874

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