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A047756 as a simple table

na(n)
00
10
21
32
42
57
612
729
855
9143
10271
11728
121428
133873
147752
1521318
1643256
17120175

[0,0,1,2,2,7,12,29,55,143,271,728,1428,3873,7752,
 21318,43256,120175]