A050394 - OEIS

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A050394 as a simple table

n	a(n)
1	1
2	-1
3	1
4	3
5	-38
6	234
7	-586
8	-9493
9	194906
10	-1981880
11	4724642
12	301409600
13	-7840250579
14	102256372812
15	-9254171165
16	-39936103724491
17	1199830608004118
18	-17733202003472076
19	-96125957089130420

[1,-1,1,3,-38,234,-586,-9493,194906,-1981880, 4724642,301409600,-7840250579,102256372812, -9254171165,-39936103724491,1199830608004118, -17733202003472076,-96125957089130420]