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A118455 formatted as a simple table:

n a(n)
1 1
2 2
3 6
4 18
5 90
6 450
7 3150
8 22050
9 154350
10 1080450
11 11884950
12 130734450
13 1699547850
14 22094122050
15 287223586650
16 3733906626450
17 63476412649650
18 1079099015044050
19 20502881285836950
20 389554744430902050

[1,2,6,18,90,450,3150,22050,154350,1080450,
 11884950,130734450,1699547850,22094122050,
 287223586650,3733906626450,63476412649650,
 1079099015044050,20502881285836950,
 389554744430902050]

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.


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