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A307646 as a simple table

na(n)
12
23
34
45
56
67
78
810
911
1012
1113
1214
1315
1417
1518
1619
1720
1821
1923
2024
2125
2227
2329
2430
2531
2632
2734
2837
2938
3039
3140
3241
3342
3443
3544
3645
3746
3847
3948
4049
4150
4251
4353
4454
4555
4656
4758
4859
4960
5061
5162
5264
5366
5467
5568
5669
5770
5871
5972
6073
6174
6275
6377
6479
6580
6681
6783
6884
6986
7087
7188
7289
7390
7491

[2,3,4,5,6,7,8,10,11,12,13,14,15,17,18,19,20,21,
 23,24,25,27,29,30,31,32,34,37,38,39,40,41,42,43,
 44,45,46,47,48,49,50,51,53,54,55,56,58,59,60,61,
 62,64,66,67,68,69,70,71,72,73,74,75,77,79,80,81,
 83,84,86,87,88,89,90,91]