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A123023 formatted as a simple table:

n a(n)
1 1
2 1
3 0
4 1
5 0
6 3
7 0
8 15
9 0
10 105
11 0
12 945
13 0
14 10395
15 0
16 135135
17 0
18 2027025
19 0
20 34459425
21 0
22 654729075
23 0
24 13749310575
25 0
26 316234143225
27 0
28 7905853580625
29 0
30 213458046676875
31 0

[1,1,0,1,0,3,0,15,0,105,0,945,0,10395,0,135135,0,
 2027025,0,34459425,0,654729075,0,13749310575,0,
 316234143225,0,7905853580625,0,213458046676875,0]

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.


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