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A003266 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 6
5 30
6 240
7 3120
8 65520
9 2227680
10 122522400
11 10904493600
12 1570247078400
13 365867569267200
14 137932073613734400
15 84138564904377984000
16 83044763560621070208000
17 132622487406311849122176000
18 342696507457909818131702784000

[1,1,1,2,6,30,240,3120,65520,2227680,122522400,
 10904493600,1570247078400,365867569267200,
 137932073613734400,84138564904377984000,
 83044763560621070208000,
 132622487406311849122176000,
 342696507457909818131702784000]

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Last modified April 15 21:48 EDT 2021. Contains 343007 sequences. (Running on oeis4.)