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A172432 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1010
1112
1214
1316
1418
1520
1622
1724
1826

[0,1,2,3,4,5,6,7,8,9,10,12,14,16,18,20,22,24,26]