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A156450
as a simple table
n
a(n)
1
1
2
0
3
0
4
4
5
4
6
0
7
0
8
1836
9
6871
10
0
11
0
12
294400160
13
3360660500
14
0
15
0
16
2033591738777760
17
62993444371397120
18
0
[1,0,0,4,4,0,0,1836,6871,0,0,294400160,3360660500, 0,0,2033591738777760,62993444371397120,0]