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A218883 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 1
6 0
7 0
8 0
9 2
10 6
11 20
12 34
13 179
14 1395
15 10039
16 68811
17 509106
18 3752134

[0,0,0,0,1,0,0,0,2,6,20,34,179,1395,10039,68811,
 509106,3752134]

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Last modified February 6 23:12 EST 2023. Contains 360111 sequences. (Running on oeis4.)