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A155256
as a simple table
n
a(n)
4
1
5
7
6
25
7
55
8
244
9
1426
10
10764
11
97667
12
1037959
13
13184770
14
219939446
15
4610420436
16
119066459836
[1,7,25,55,244,1426,10764,97667,1037959,13184770, 219939446,4610420436,119066459836]