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A279486 as a simple table

na(n)
12
23
34
45
56
67
710
811
912
1013
1114
1215
1316
1417
1518
1619
1720
1821
1922
2023
2124
2225
2326
2429
2530
2631
2732
2833
2934
3037
3138
3239
3340
3441
3542
3643
3744
3845
3946
4047
4148
4249
4350
4451
4552
4653
4754
4855
4956
5057
5158
5259
5360
5461
5562
5663
5766
5867
5968
6069
6170
6271
6374
6475
6576
6677

[2,3,4,5,6,7,10,11,12,13,14,15,16,17,18,19,20,21,
 22,23,24,25,26,29,30,31,32,33,34,37,38,39,40,41,
 42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,
 58,59,60,61,62,63,66,67,68,69,70,71,74,75,76,77]