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A052687 formatted as a simple table:

n a(n)
0 1
1 2
2 6
3 18
4 96
5 480
6 3600
7 25200
8 241920
9 2177280
10 25401600
11 279417600
12 3832012800
13 49816166400
14 784604620800
15 11769069312000
16 209227898880000
17 3556874280960000
18 70426110763008000
19 1338096104497152000

[1,2,6,18,96,480,3600,25200,241920,2177280,
 25401600,279417600,3832012800,49816166400,
 784604620800,11769069312000,209227898880000,
 3556874280960000,70426110763008000,
 1338096104497152000]

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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