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A368904 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1113
1214
1317
1418
1519
1621
1722
1823
1924
2025
2126
2227
2329
2430
2531
2632
2733
2834
2936
3037
3138
3240
3341
3442
3543
3645
3746
3847
3948
4049
4150
4253
4354
4456
4557
4658
4759
4860
4961
5062
5163
5264
5365
5466
5567
5669
5770
5871
5972
6073
6174
6275
6377
6478
6579
6680
6782
6883
6984
7085
7186
7288
7389
7490
7593
7694
7796
7897
7998
8099
81100

[2,3,4,5,6,7,8,9,10,11,13,14,17,18,19,21,22,23,24,
 25,26,27,29,30,31,32,33,34,36,37,38,40,41,42,43,
 45,46,47,48,49,50,53,54,56,57,58,59,60,61,62,63,
 64,65,66,67,69,70,71,72,73,74,75,77,78,79,80,82,
 83,84,85,86,88,89,90,93,94,96,97,98,99,100]