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A224530 as a simple table

n a(n)
0 1
1 0
2 2
3 6
4 30
5 144
6 758
7 4080
8 22702
9 128832

[1,0,2,6,30,144,758,4080,22702,128832]

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Last modified May 20 10:33 EDT 2022. Contains 353871 sequences. (Running on oeis4.)