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A155290
as a simple table
n
a(n)
4
1
5
7
6
25
7
64
8
265
9
1577
10
11987
11
107928
12
1180991
13
15701569
14
264954393
15
5697447937
16
151647215266
[1,7,25,64,265,1577,11987,107928,1180991,15701569, 264954393,5697447937,151647215266]