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A058381 as a simple table

n a(n)
0 0
1 1
2 1
3 4
4 20
5 156
6 1472
7 17396
8 239612
9 3827816
10 69071272
11 1394315088
12 31081310944
13 758901184432
14 20135117147056
15 576927779925568
16 17752780676186432
17 583910574851160000
18 20443098012485430272
19 759064322969950283072
20 29793617955495321025472

[0,1,1,4,20,156,1472,17396,239612,3827816,
 69071272,1394315088,31081310944,758901184432,
 20135117147056,576927779925568,17752780676186432,
 583910574851160000,20443098012485430272,
 759064322969950283072,29793617955495321025472]

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)