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A129826 as a simple table

na(n)
01
1-1
2-2
3-4
4-4
524
6120
7-960
8-12096
9120960
103024000
11-36288000
12-1576143360
1322066007040
141525620096000
15-24409921536000
16-2522591034163200
1745406638614937600
186686974460694528000
19-133739489213890560000
20-27033456071346536448000
21594736033569623801856000

[1,-1,-2,-4,-4,24,120,-960,-12096,120960,3024000,
 -36288000,-1576143360,22066007040,1525620096000,
 -24409921536000,-2522591034163200,
 45406638614937600,6686974460694528000,
 -133739489213890560000,-27033456071346536448000,
 594736033569623801856000]