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A010370 as a simple table

na(n)
01
1-4
2-12
3-80
4-700
5-7056
6-77616
7-906048
8-11042460
9-139053200
10-1796567344
11-23696871744
12-317933029232
13-4326899214400
14-59605244280000
15-829705000377600
16-11654762427179100
17-165021757273414800
18-2353088020380174000
19-33764531705178120000

[1,-4,-12,-80,-700,-7056,-77616,-906048,-11042460,
 -139053200,-1796567344,-23696871744,-317933029232,
 -4326899214400,-59605244280000,-829705000377600,
 -11654762427179100,-165021757273414800,
 -2353088020380174000,-33764531705178120000]