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A026304
as a simple table
n
a(n)
0
1
1
4
2
35
3
340
4
3484
5
36784
6
395922
7
4319172
8
47588100
9
528328108
10
5901043161
11
66233871972
12
746434573208
[1,4,35,340,3484,36784,395922,4319172,47588100, 528328108,5901043161,66233871972,746434573208]