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A098579 as a simple table

na(n)
01
1-4
2-8
3-32
4-160
5-896
6-5376
7-33792
8-219648
9-1464320
10-9957376
11-68796416
12-481574912
13-3408068608
14-24343347200
15-175272099840
16-1270722723840
17-9268801044480
18-67971207659520
19-500840477491200
20-3706219533434880

[1,-4,-8,-32,-160,-896,-5376,-33792,-219648,
 -1464320,-9957376,-68796416,-481574912,
 -3408068608,-24343347200,-175272099840,
 -1270722723840,-9268801044480,-67971207659520,
 -500840477491200,-3706219533434880]