A013073 - OEIS

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A013073 as a simple table

n	a(n)
0	0
1	2
2	-1
3	-15
4	42
5	661
6	-4890
7	-66619
8	1034936
9	11317021
10	-345817440
11	-2547339861
12	165729594888
13	460712169615
14	-106781858632176
15	333854778870681
16	88033258608789600
17	-955215842270538663

[0,2,-1,-15,42,661,-4890,-66619,1034936,11317021, -345817440,-2547339861,165729594888,460712169615, -106781858632176,333854778870681, 88033258608789600,-955215842270538663]