A185424 - OEIS

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A185424 as a simple table

n	a(n)
0	1
1	-1
2	1
3	-1
4	19
5	-5
6	253
7	-61
8	3319
9	-1385
10	222557
11	-50521
12	422152729
13	-2702765
14	59833795
15	-199360981
16	439264083023
17	-19391512145
18	76632373664299
19	-2404879675441
20	4432283799315809
21	-370371188237525

[1,-1,1,-1,19,-5,253,-61,3319,-1385,222557,-50521, 422152729,-2702765,59833795,-199360981, 439264083023,-19391512145,76632373664299, -2404879675441,4432283799315809,-370371188237525]