login

A151681 as a simple table

na(n)
01
12
21
32
42
54
61
72
82
94
102
115
124
137
141
152
162
174
182
195
204
217
222
235
244
258
265
2712
287
2911
301
312
322
334
342
355
364
377
382
395
404
418
425
4312
447
4511
462
475
484
498
505
5112
527
5312
545
5512
568
5717
5812
5926
6011
6116
621
632
642
654
662
675
684
697
702
715
724
738
745
7512
767
7711
782
795
804
818
825
8312
847
8512
865
8712
888
8917
9012
9126
9211
9316

[1,2,1,2,2,4,1,2,2,4,2,5,4,7,1,2,2,4,2,5,4,7,2,5,
 4,8,5,12,7,11,1,2,2,4,2,5,4,7,2,5,4,8,5,12,7,11,2,
 5,4,8,5,12,7,12,5,12,8,17,12,26,11,16,1,2,2,4,2,5,
 4,7,2,5,4,8,5,12,7,11,2,5,4,8,5,12,7,12,5,12,8,17,
 12,26,11,16]