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A290883 as a simple table

n a(n)
0 1
1 2
2 -20
3 920
4 -95600
5 17588000
6 -5034785600
7 2068322672000
8 -1153339941728000
9 838147215114560000
10 -769492266756037760000
11 870869784123573927680000
12 -1191080747725445120960000000
13 1936606018449416970940544000000
14 -3692030834904045806243452160000000
15 8156631422332715861303860160000000000
16 -20671774666617006397027638099614720000000

[1,2,-20,920,-95600,17588000,-5034785600,
 2068322672000,-1153339941728000,
 838147215114560000,-769492266756037760000,
 870869784123573927680000,
 -1191080747725445120960000000,
 1936606018449416970940544000000,
 -3692030834904045806243452160000000,
 8156631422332715861303860160000000000,
 -20671774666617006397027638099614720000000]

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Last modified August 24 09:00 EDT 2024. Contains 375409 sequences. (Running on oeis4.)