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A274640 as a simple table

na(n)
01
12
23
34
42
53
64
75
86
91
104
116
122
131
146
155
163
171
185
192
206
211
222
234
245
253
267
278
285
294
309
317
328
333
3410
3511
364
377
388
396
403
419
425
437
448
459
4610
4711
4812
496
508
519
5211
5310
5412
5513
567
576
5810
599
6012
6113
6214
6315
648
652
669
6712
687
6910
7011
7113
7214
7310
749
756
7613
775
783
7915
8016
817
821
8310
8413
8512
8614
8711
8815
893
908
915
921
9312
9411
9514
967
974
982
9916
1009
10117
1021
1038
10411

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