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A219903
as a simple table
n
a(n)
0
0
1
0
2
0
3
0
4
4
5
15
6
48
7
111
8
238
9
441
10
782
11
1279
12
2029
13
3055
14
4499
15
6390
[0,0,0,0,4,15,48,111,238,441,782,1279,2029,3055, 4499,6390]