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A376371 as a simple table

na(n)
12
23
34
45
57
68
79
811
913
1014
1116
1217
1318
1419
1522
1623
1725
1826
1927
2029
2131
2232
2333
2434
2537
2638
2739
2840
2941
3043
3144
3246
3347
3448
3549
3650
3751
3852
3953
4054
4157
4258
4359
4461
4562
4663
4764
4865
4967
5068
5169
5271
5373
5474
5575
5676
5777
5879
5980
6081
6182
6283
6385
6486
6587
6688
6789

[2,3,4,5,7,8,9,11,13,14,16,17,18,19,22,23,25,26,
 27,29,31,32,33,34,37,38,39,40,41,43,44,46,47,48,
 49,50,51,52,53,54,57,58,59,61,62,63,64,65,67,68,
 69,71,73,74,75,76,77,79,80,81,82,83,85,86,87,88,
 89]