A022712 - OEIS

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A022712 as a simple table

n	a(n)
0	1
1	-20
2	170
3	-800
4	2415
5	-6404
6	21550
7	-71080
8	178295
9	-419200
10	1203282
11	-3294360
12	7476320
13	-17381780
14	44919500
15	-107605880
16	237628435
17	-544086720
18	1273805460
19	-2864694880
20	6256648862
21	-13710129840

[1,-20,170,-800,2415,-6404,21550,-71080,178295, -419200,1203282,-3294360,7476320,-17381780, 44919500,-107605880,237628435,-544086720, 1273805460,-2864694880,6256648862,-13710129840]