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A000171 formatted as a simple table:

n a(n)
1 1
2 0
3 0
4 1
5 2
6 0
7 0
8 10
9 36
10 0
11 0
12 720
13 5600
14 0
15 0
16 703760
17 11220000
18 0
19 0
20 9168331776
21 293293716992
22 0
23 0
24 1601371799340544
25 102484848265030656
26 0
27 0
28 3837878966366932639744
29 491247277315343649710080
30 0
31 0

[1,0,0,1,2,0,0,10,36,0,0,720,5600,0,0,703760,
 11220000,0,0,9168331776,293293716992,0,0,
 1601371799340544,102484848265030656,0,0,
 3837878966366932639744,491247277315343649710080,0,
 0]

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


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