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A215718 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 4320
8 34560
9 311040
10 3110400
11 34214400
12 410572800
13 5337446400
14 69386803200
15 1040802048000
16 16652832768000
17 283098157056000
18 5095766827008000
19 96819569713152000
20 1936391394263040000
21 38727827885260800000
22 852012213475737600000

[1,1,2,6,24,120,720,4320,34560,311040,3110400,
 34214400,410572800,5337446400,69386803200,
 1040802048000,16652832768000,283098157056000,
 5095766827008000,96819569713152000,
 1936391394263040000,38727827885260800000,
 852012213475737600000]

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Last modified May 31 07:30 EDT 2020. Contains 334747 sequences. (Running on oeis4.)