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A234720
as a simple table
n
a(n)
1
240
2
3976
3
33560
4
357208
5
2557656
6
23137720
7
157274648
8
1310504248
9
8760624600
[240,3976,33560,357208,2557656,23137720,157274648, 1310504248,8760624600]