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A290021 as a simple table

na(n)
01
12
23
33
44
54
64
74
85
95
104
115
125
136
145
155
165
176
186
196
206
215
225
236
247
256
267
276
285
295
306
317
327
337
347
356
365
376
386
397
407
418
427
437
446
456
466
477
487
497
508
518
527
537
547
556
565
577
588
597
608
618
628
637
648
657
665
676
686
698
708
718
728
738
748
758
768
776
786
796
807
817
828
839
848
858
868

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