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A305431 as a simple table

na(n)
01
12
21
31
43
54
62
73
84
91
103
111
121
132
141
152
165
176
182
197
208
214
222
231
243
257
261
274
287
297
301
311
329
331
347
3510
361
3711
381
392
4012
418
425
437
441
451
462
478
484
497
501
517
527
538
543
552
568
577
581
597
607
611
622
631
6413
6514
667
6711
686
691
7012
7114
723
7311
748
758
767
7715
781
7916
8010
8117
823
8317
8416
853
861
8715
883
891
907
917
921
931
947
956
965
977
986
991
1007
10111
1021
1038
1048
1051

[1,2,1,1,3,4,2,3,4,1,3,1,1,2,1,2,5,6,2,7,8,4,2,1,
 3,7,1,4,7,7,1,1,9,1,7,10,1,11,1,2,12,8,5,7,1,1,2,
 8,4,7,1,7,7,8,3,2,8,7,1,7,7,1,2,1,13,14,7,11,6,1,
 12,14,3,11,8,8,7,15,1,16,10,17,3,17,16,3,1,15,3,1,
 7,7,1,1,7,6,5,7,6,1,7,11,1,8,8,1]