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A048897 formatted as a simple table:

n a(n)
1 1
2 5
3 1
4 45
5 15
6 1
7 585
8 255
9 30
10 1
11 9945
12 5175
13 825
14 50
15 1
16 208845
17 123795
18 24150

[1,5,1,45,15,1,585,255,30,1,9945,5175,825,50,1,
 208845,123795,24150]

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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