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A000568 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 12
6 56
7 456
8 6880
9 191536
10 9733056
11 903753248
12 154108311168
13 48542114686912
14 28401423719122304
15 31021002160355166848
16 63530415842308265100288
17 244912778438520759443245824
18 1783398846284777975419600287232
19 24605641171260376770598003978281472

[1,1,1,2,4,12,56,456,6880,191536,9733056,
 903753248,154108311168,48542114686912,
 28401423719122304,31021002160355166848,
 63530415842308265100288,
 244912778438520759443245824,
 1783398846284777975419600287232,
 24605641171260376770598003978281472]

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Last modified March 29 05:16 EDT 2024. Contains 371264 sequences. (Running on oeis4.)