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A165964 as a simple table

n a(n)
1 1
2 1
3 0
4 4
5 16
6 86
7 542
8 3932
9 32330
10 297438
11 3028320
12 33814454
13 410954878
14 5400878692
15 76329470882
16 1154445436334
17 18606430004984
18 318369275913710
19 5764046146341198
20 110091446931897180
21 2212282487296335866

[1,1,0,4,16,86,542,3932,32330,297438,3028320,
 33814454,410954878,5400878692,76329470882,
 1154445436334,18606430004984,318369275913710,
 5764046146341198,110091446931897180,
 2212282487296335866]

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Last modified July 4 14:29 EDT 2020. Contains 335448 sequences. (Running on oeis4.)