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A000121 as a simple table

na(n)
01
12
22
33
43
53
64
73
84
95
104
115
124
134
146
155
166
176
185
196
204
215
227
236
248
257
266
278
286
297
308
316
327
335
345
358
367
379
389
398
4010
417
428
4310
448
4510
468
477
4810
498
509
519
527
538
545
556
569
578
5811
5910
609
6112
629
6311
6413
6510
6612
679
688
6912
7010
7112
7212
7310
7412
758
769
7712
7810
7913
8011
819
8212
839
8410
8511
868
879
886
896
9010
919

[1,2,2,3,3,3,4,3,4,5,4,5,4,4,6,5,6,6,5,6,4,5,7,6,
 8,7,6,8,6,7,8,6,7,5,5,8,7,9,9,8,10,7,8,10,8,10,8,
 7,10,8,9,9,7,8,5,6,9,8,11,10,9,12,9,11,13,10,12,9,
 8,12,10,12,12,10,12,8,9,12,10,13,11,9,12,9,10,11,
 8,9,6,6,10,9]