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A246957
as a simple table
n
a(n)
1
3
2
12
3
552
4
6978816
5
429714433137180672
6
868161947968780041877535786874146453722578812928
[3,12,552,6978816,429714433137180672, 868161947968780041877535786874146453722578812928]