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A144704 as a simple table

na(n)
01
1-4
2-48
3-320
4-1792
5-9216
6-45056
7-212992
8-983040
9-4456448
10-19922944
11-88080384
12-385875968
13-1677721600
14-7247757312
15-31138512896
16-133143986176
17-566935683072
18-2405181685760
19-10170482556928

[1,-4,-48,-320,-1792,-9216,-45056,-212992,-983040,
 -4456448,-19922944,-88080384,-385875968,
 -1677721600,-7247757312,-31138512896,
 -133143986176,-566935683072,-2405181685760,
 -10170482556928]