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A007451 formatted as a simple table:

n a(n)
0 1
1 3
2 3
3 90
4 18
5 945
6 1890
7 12600
8 22680
9 53460
10 1247400
11 10216206000
12 157172400
13 1021620600
14 6129723600
15 534386160000
16 81729648000
17 2494674910728000
18 127932046704000
19 2744142401800800000

[1,3,3,90,18,945,1890,12600,22680,53460,1247400,
 10216206000,157172400,1021620600,6129723600,
 534386160000,81729648000,2494674910728000,
 127932046704000,2744142401800800000]

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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.


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