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A136399 as a simple table

na(n)
12
23
34
45
56
67
78
89
912
1013
1114
1215
1316
1417
1518
1619
1720
1821
1922
2023
2124
2225
2326
2427
2528
2629
2730
2831
2932
3033
3134
3235
3336
3437
3538
3639
3740
3841
3942
4043
4144
4245
4346
4447
4548
4649
4750
4851
4952
5053
5154
5255
5356
5457
5558
5659
5760
5861
5962
6063
6164
6265
6366
6467
6568
6669
6770
6871
6972
7073
7174
7275

[2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,20,21,22,
 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,
 71,72,73,74,75]