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A199939
as a simple table
n
a(n)
1
8
2
56
3
376
4
2474
5
16114
6
104268
7
672866
8
4334232
9
27893374
10
179433990
11
1154022716
12
7420994944
13
47717937374
[8,56,376,2474,16114,104268,672866,4334232, 27893374,179433990,1154022716,7420994944, 47717937374]