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A059831 as a simple table

n a(n)
0 0
1 -2
2 -4
3 -20
4 -252
5 -5610
6 -187944
7 -8760272
8 -540315160
9 -42535905530
10 -4158250120140
11 -493938370048692
12 -70043599065844404
13 -11684931733886455730
14 -2264985487707963662992
15 -504752888883221450120000
16 -128137017404994234514023024

[0,-2,-4,-20,-252,-5610,-187944,-8760272,
 -540315160,-42535905530,-4158250120140,
 -493938370048692,-70043599065844404,
 -11684931733886455730,-2264985487707963662992,
 -504752888883221450120000,
 -128137017404994234514023024]

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Last modified October 15 17:08 EDT 2021. Contains 348033 sequences. (Running on oeis4.)