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A007880 as a simple table

na(n)
01
12
23
35
41
52
63
76
81
92
103
117
121
132
143
158
161
172
183
199
201
212
223
2310
241
252
263
2711
281
292
303
3112
321
332
343
3513
361
372
383
3914
401
412
423
4315
441
452
463
4716
481
492
503
515
521
532
543
556
561
572
583
597
601
612
623
638
641
652
663
679
681
692
703
7110
721
732
743
7511
761
772
783
7912
801
812
823
8313
841
852
863
8714
881
892
903
9115
921
932
943
9516

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