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A285420 as a simple table

na(n)
12
23
35
46
57
68
710
811
913
1014
1115
1216
1318
1419
1521
1622
1724
1825
1927
2028
2129
2230
2332
2433
2535
2636
2737
2838
2940
3041
3143
3244
3345
3446
3548
3649
3751
3852
3953
4054
4156
4257
4359
4460
4562
4663
4765
4866
4967
5068
5170
5271
5373
5474
5575
5676
5778
5879
5981
6082
6184
6285
6387
6488
6589
6690

[2,3,5,6,7,8,10,11,13,14,15,16,18,19,21,22,24,25,
 27,28,29,30,32,33,35,36,37,38,40,41,43,44,45,46,
 48,49,51,52,53,54,56,57,59,60,62,63,65,66,67,68,
 70,71,73,74,75,76,78,79,81,82,84,85,87,88,89,90]