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A216413 as a simple table

n a(n)
0 1
1 1
2 1
3 6
4 28
5 235
6 2466
7 31864
8 488328
9 8901981
10 183417490
11 4300791946
12 111621409956
13 3214239089659
14 100662133475372
15 3440691046061130
16 126342964714732576
17 4999000389915029881
18 210671936366279249610
19 9474491260037610708598
20 450638933972015166026220

[1,1,1,6,28,235,2466,31864,488328,8901981,
 183417490,4300791946,111621409956,3214239089659,
 100662133475372,3440691046061130,
 126342964714732576,4999000389915029881,
 210671936366279249610,9474491260037610708598,
 450638933972015166026220]

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Last modified December 10 12:15 EST 2019. Contains 329895 sequences. (Running on oeis4.)