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A254861
as a simple table
n
a(n)
0
0
1
4
2
22
3
102
4
903
5
6310
6
46706
7
266823
8
2774348
9
16531372
10
419285780
11
3698719206
12
33962823012
[0,4,22,102,903,6310,46706,266823,2774348, 16531372,419285780,3698719206,33962823012]