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A036699 as a simple table

na(n)
00
11
22
34
45
58
68
79
812
914
1016
1115
1216
1322
1421
1524
1622
1726
1827
1930
2032
2129
2236
2334
2435
2542

[0,1,2,4,5,8,8,9,12,14,16,15,16,22,21,24,22,26,27,
 30,32,29,36,34,35,42]