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A066989 as a simple table

n a(n)
1 1
2 9
3 251
4 16280
5 2048824
6 444273984
7 152759224512
8 78340747014144
9 57175952894078976
10 57223737619918848000
11 76212579497951858688000
12 131758938842553681444864000
13 289584291977410916858462208000
14 794860754824699647616459210752000 

[1,9,251,16280,2048824,444273984,152759224512,
 78340747014144,57175952894078976,
 57223737619918848000,76212579497951858688000,
 131758938842553681444864000,
 289584291977410916858462208000,
 794860754824699647616459210752000]

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Last modified May 12 22:06 EDT 2024. Contains 372495 sequences. (Running on oeis4.)