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The On-Line Encyclopedia of Integer Sequences
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A006612
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
2
6
6
7
21
8
75
9
411
10
2114
11
13529
12
108243
[0,0,0,0,2,6,21,75,411,2114,13529,108243]