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A126009 as a simple table

na(n)
00
12
21
33
49
510
68
712
86
94
105
1111
127
1317
1418
1519
1620
1713
1814
1915
2016
2121

[0,2,1,3,9,10,8,12,6,4,5,11,7,17,18,19,20,13,14,
 15,16,21]