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A052661 as a simple table

n a(n)
0 2
1 1
2 4
3 12
4 72
5 480
6 4320
7 45360
8 564480
9 7983360
10 127008000
11 2235340800
12 43110144000
13 902918016000
14 20399720140800
15 494300911104000
16 12783824621568000
17 351419178958848000
18 10230993181753344000

[2,1,4,12,72,480,4320,45360,564480,7983360,
 127008000,2235340800,43110144000,902918016000,
 20399720140800,494300911104000,12783824621568000,
 351419178958848000,10230993181753344000]

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Last modified May 17 23:39 EDT 2024. Contains 372608 sequences. (Running on oeis4.)