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A271858
as a simple table
n
a(n)
1
0
2
1
3
1
4
2
5
5
6
20
7
56
8
276
9
2136
10
13756
11
148352
12
2727448
13
41044816
14
1056334024
15
46033137324
[0,1,1,2,5,20,56,276,2136,13756,148352,2727448, 41044816,1056334024,46033137324]
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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)