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A180069 as a simple table

n a(n)
2 0
3 2
4 2
5 6
6 34
7 132
8 448
9 1986
10 8422
11 39902
12 195946
13 1024366
14 5505428
15 31185644
16 183904498
17 1119250852
18 7025176096

[0,2,2,6,34,132,448,1986,8422,39902,195946,
 1024366,5505428,31185644,183904498,1119250852,
 7025176096]

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Last modified April 17 05:12 EDT 2021. Contains 343059 sequences. (Running on oeis4.)