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A210425
as a simple table
n
a(n)
1
0
2
0
3
4
4
60
5
374
6
1960
7
9103
8
40497
9
174127
10
735268
11
3064477
12
12664101
13
52005445
14
212595280
15
866047122
[0,0,4,60,374,1960,9103,40497,174127,735268, 3064477,12664101,52005445,212595280,866047122]