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A045915
as a simple table
n
a(n)
2
4
3
24
4
144
5
908
6
6117
7
44159
8
332775
9
2592589
10
20758019
11
169922924
12
1416703346
13
11992874160
14
10283824252
[4,24,144,908,6117,44159,332775,2592589,20758019, 169922924,1416703346,11992874160,10283824252]