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A266549
as a simple table
n
a(n)
1
0
2
1
3
1
4
3
5
6
6
25
7
86
8
414
9
1975
10
10479
11
56572
12
316577
13
1800363
14
10419605
15
61061169
16
361978851
[0,1,1,3,6,25,86,414,1975,10479,56572,316577, 1800363,10419605,61061169,361978851]