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A057974
as a simple table
n
a(n)
0
4
1
8
2
86
3
148
4
540
5
1574
6
6344
7
14406
8
63836
9
24317046
10
1723718810
11
4303212632
12
59865566356
13
78575930302
[4,8,86,148,540,1574,6344,14406,63836,24317046, 1723718810,4303212632,59865566356,78575930302]