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A173315 as a simple table

na(n)
01
11
22
3-4
40
516
6-48
796
8-160
9256
10-448
11896
12-1920
134096
14-8448
1516896
16-33280
1765536
18-130048
19260096
20-522240
211048576
22-2101248
234202496
24-8396800
2516777216
26-33538048
2767076096
28-134184960
29268435456
30-536936448
311073872896
32-2147614720
334294967296

[1,1,2,-4,0,16,-48,96,-160,256,-448,896,-1920,
 4096,-8448,16896,-33280,65536,-130048,260096,
 -522240,1048576,-2101248,4202496,-8396800,
 16777216,-33538048,67076096,-134184960,268435456,
 -536936448,1073872896,-2147614720,4294967296]