A004421 - OEIS

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A004421 as a simple table

n	a(n)
0	1
1	-40
2	840
3	-12320
4	141640
5	-1358448
6	11297440
7	-83631680
8	561539400
9	-3468363400
10	19922193200
11	-107343635040
12	546373245600
13	-2642351627440
14	12200693947200
15	-54007656632000
16	230002160331080
17	-945228781171920

[1,-40,840,-12320,141640,-1358448,11297440, -83631680,561539400,-3468363400,19922193200, -107343635040,546373245600,-2642351627440, 12200693947200,-54007656632000,230002160331080, -945228781171920]