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A207410 as a simple table

na(n)
10
20
30
40
51
64
725
8136
9772
104953
1135340
12288335
132632792
1426726855
15296550560

[0,0,0,0,1,4,25,136,772,4953,35340,288335,2632792,
 26726855,296550560]