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A263867 as a simple table

n a(n)
2 2
3 4
4 12
5 48
6 280
7 1864
8 14840
9 132276
10 1323504

[2,4,12,48,280,1864,14840,132276,1323504]

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Last modified September 28 04:28 EDT 2022. Contains 357063 sequences. (Running on oeis4.)