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A059831 as a simple table

na(n)
00
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]