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A046821 as a simple table

na(n)
01
12
23
31
43
53
65
72
83
94
104
113
125
132
144
153
163
174
185
192
204
214
226
234
245
256
263
272
284
293
305
314
323
334
345
353
365
375
387
393
404
415
425
434
446
454
466
475
485
496
507
511
523
533
545
553
564
575
584
593
605
614
626
635
643
654
665
673
685
695
707
714
725
736
746
755
767
773
785
794
804
815
826
833
845
855
867
875
886
897
905
914
926

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