A046126 - OEIS

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A046126 as a simple table

n	a(n)
0	1
1	3
2	-3
3	-15
4	45
5	315
6	-1575
7	-14175
8	99225
9	1091475
10	-9823275
11	-127702575
12	1404728325
13	21070924875
14	-273922023375
15	-4656674397375
16	69850115960625
17	1327152203251875
18	-22561587455281875
19	-473793336560919375

[1,3,-3,-15,45,315,-1575,-14175,99225,1091475, -9823275,-127702575,1404728325,21070924875, -273922023375,-4656674397375,69850115960625, 1327152203251875,-22561587455281875, -473793336560919375]