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A156926 as a simple table

n a(n)
0 1
1 2
2 -8
3 -96
4 4608
5 1105920
6 -1592524800
7 -16052649984000
8 1294485694709760000
9 939485937792555417600000
10 -6818413142123250198773760000000
11 -544338467423010707068824846336000000000
12 521477993674340011006196823029396275200000000000

[1,2,-8,-96,4608,1105920,-1592524800,
 -16052649984000,1294485694709760000,
 939485937792555417600000,
 -6818413142123250198773760000000,
 -544338467423010707068824846336000000000,
 521477993674340011006196823029396275200000000000]

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)