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A246780 as a simple table

na(n)
12
23
34
46
58
69
711
812
913
1014
1115
1216
1317
1418
1519
1621
1722
1823
1924
2025
2126
2227
2328
2429
2530
2631
2732
2833
2934
3035
3136
3237
3338
3439
3540
3641
3742
3843
3944
4045
4146
4247
4348
4449
4550
4651
4752
4853
4954
5055
5156
5257
5358
5459
5560
5661
5762
5863
5964
6065
6166
6267
6368
6469
6570

[2,3,4,6,8,9,11,12,13,14,15,16,17,18,19,21,22,23,
 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,
 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,
 56,57,58,59,60,61,62,63,64,65,66,67,68,69,70]