A009498 - OEIS

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A009498 as a simple table

n	a(n)
0	1
1	3
2	-3
3	-1113
4	-77063
5	-5509845
6	-430006731
7	-33282260529
8	-1454472663311
9	448480622503635
10	254015086363619949
11	101877925964986614135
12	39296835590108099513833
13	15506451718661316904568571

[1,3,-3,-1113,-77063,-5509845,-430006731, -33282260529,-1454472663311,448480622503635, 254015086363619949,101877925964986614135, 39296835590108099513833, 15506451718661316904568571]