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A056075
as a simple table
n
a(n)
1
1
2
4
3
56
4
7192
5
7232
6
7912
7
10792
8
17272
9
30592
10
114256
11
2154584
12
3428368
13
44375136
14
89245784
15
2739393699744
[1,4,56,7192,7232,7912,10792,17272,30592,114256, 2154584,3428368,44375136,89245784,2739393699744]