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A280803
as a simple table
n
a(n)
1
0
2
1
3
56
4
2146
5
41931
6
547197
7
5219491
8
39260363
9
247768745
10
1379016025
11
7040775017
[0,1,56,2146,41931,547197,5219491,39260363, 247768745,1379016025,7040775017]