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A124639
as a simple table
n
a(n)
0
1
1
0
2
3
3
4
4
12
5
20
6
52
7
84
8
198
9
352
10
730
11
1332
12
2648
13
4808
14
9232
15
16780
16
31227
17
56312
18
102641
19
182808
[1,0,3,4,12,20,52,84,198,352,730,1332,2648,4808, 9232,16780,31227,56312,102641,182808]