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A215262
as a simple table
n
a(n)
0
0
1
1
2
48
3
290
4
581
5
1163
6
2327
7
13964
8
7492468716
9
14984937433
10
1078915495184
[0,1,48,290,581,1163,2327,13964,7492468716, 14984937433,1078915495184]