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A343904
as a simple table
n
a(n)
1
4
2
45
3
304
4
464
5
1870
6
6048
7
14421
8
119072
9
130304
10
561824
11
1736150
12
8124416
13
9519296
14
16303104
15
26409026
[4,45,304,464,1870,6048,14421,119072,130304, 561824,1736150,8124416,9519296,16303104,26409026]