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A081605 as a simple table

na(n)
10
23
36
49
510
611
712
815
918
1019
1120
1221
1324
1427
1528
1629
1730
1831
1932
2033
2134
2235
2336
2437
2538
2639
2742
2845
2946
3047
3148
3251
3354
3455
3556
3657
3758
3859
3960
4061
4162
4263
4364
4465
4566
4669
4772
4873
4974
5075
5178
5281
5382
5483
5584
5685
5786
5887
5988
6089
6190
6291
6392
6493
6594
6695
6796
6897
6998
7099
71100

[0,3,6,9,10,11,12,15,18,19,20,21,24,27,28,29,30,
 31,32,33,34,35,36,37,38,39,42,45,46,47,48,51,54,
 55,56,57,58,59,60,61,62,63,64,65,66,69,72,73,74,
 75,78,81,82,83,84,85,86,87,88,89,90,91,92,93,94,
 95,96,97,98,99,100]