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A323739 as a simple table

n a(n)
0 2
1 1
2 1
3 2
4 6
5 30
6 180
7 1440
8 12960
9 142560
10 1995840
11 29937600
12 538876800
13 10777536000
14 226328256000
15 5205549888000
16 135344297088000
17 3924984615552000
18 117749538466560000
19 3885734769396480000
20 136000716928876800000
21 4896025809439564800000
22 190945006568143027200000

[2,1,1,2,6,30,180,1440,12960,142560,1995840,
 29937600,538876800,10777536000,226328256000,
 5205549888000,135344297088000,3924984615552000,
 117749538466560000,3885734769396480000,
 136000716928876800000,4896025809439564800000,
 190945006568143027200000]

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Last modified April 23 07:57 EDT 2024. Contains 371905 sequences. (Running on oeis4.)