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A307981 as a simple table

na(n)
01
12
22
33
44
53
63
73
82
92
103
113
123
133
143
152
162
173
182
191
205
214
221
234
244
254
264
275
286
293
305
315
322
334
344
353
365
375
383
393
404
413
423
432
445
453
463
475
482
492
503
513
525
532
544
554
563
573
585
596
603
615
626
633
644
654
665
677
685
694
702
713
722
733
742
754
763
773
783
793
804
815
826
838
847
857
866
877
888
896
907
914
925
934
944
952
962
974
984
995
1004

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