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A022895 formatted as a simple table:

n a(n)
1 0
2 1
3 0
4 1
5 0
6 1
7 0
8 4
9 0
10 7
11 0
12 24
13 0
14 70
15 0
16 219
17 0
18 712
19 0
20 2357
21 0

[0,1,0,1,0,1,0,4,0,7,0,24,0,70,0,219,0,712,0,2357,
 0]

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.


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