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A124638 as a simple table

na(n)
01
10
23
34
412
520
645
780
8168
9296
10573
111012
121874
133268
145824
1510020
1617338
1729308
1849511
1982168

[1,0,3,4,12,20,45,80,168,296,573,1012,1874,3268,
 5824,10020,17338,29308,49511,82168]