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A004143 as a simple table

na(n)
10
21
32
45
510
640
740
8105
95627
1014501
11330861
12658110
13897229
1426673531
15180566007
16180566007
1719299107624

[0,1,2,5,10,40,40,105,5627,14501,330861,658110,
 897229,26673531,180566007,180566007,19299107624]