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A180020 as a simple table

na(n)
10
20
33
44
57
67
79
810
912
1014
1114
1217
1317
1419
1521
1622
1723
1825
1926
2028
2129
2231
2332
2434
2535
2636
2738
2839
2941
3042
3144
3245
3346
3448
3549
3651
3753
3853
3955
4057
4158
4260
4360
4463
4564
4665
4767
4868
4969
5071
5173
5274
5375
5477
5578
5680
5781
5883
5984
6085
6187
6288
6390
6491
6593
6694
6796
6897
6998
70100
71101

[0,0,3,4,7,7,9,10,12,14,14,17,17,19,21,22,23,25,
 26,28,29,31,32,34,35,36,38,39,41,42,44,45,46,48,
 49,51,53,53,55,57,58,60,60,63,64,65,67,68,69,71,
 73,74,75,77,78,80,81,83,84,85,87,88,90,91,93,94,
 96,97,98,100,101]