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A076823 as a simple table

na(n)
1-1
21
31
4-16
512
6-1
7381
8-3312
92160
101
11-10496
121603680
13-10137600
146048000
15-1
16307505
17-1022881200
1892708406000
19-476703360000
20266716800000
211
22-9316560
23750409713900
24-1242627237734400
2578981336366912000
26-349935855575040000
27186313420339200000
28-1

[-1,1,1,-16,12,-1,381,-3312,2160,1,-10496,1603680,
 -10137600,6048000,-1,307505,-1022881200,
 92708406000,-476703360000,266716800000,1,-9316560,
 750409713900,-1242627237734400,78981336366912000,
 -349935855575040000,186313420339200000,-1]