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A009658 as a simple table

n a(n)
0 1
1 2
2 8
3 -120
4 -12160
5 -750080
6 -36334464
7 147613952
8 499312189440
9 118002014031872
10 18886517107687424
11 1095225249188249600
12 -831828929736605794304
13 -517984611085464701173760

[1,2,8,-120,-12160,-750080,-36334464,147613952,
 499312189440,118002014031872,18886517107687424,
 1095225249188249600,-831828929736605794304,
 -517984611085464701173760]

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Last modified May 26 01:25 EDT 2024. Contains 372807 sequences. (Running on oeis4.)