A005432
formatted as a simple table:
n
a(n)
0
1
1
1
2
2
3
6
4
30
5
156
6
1455
7
11300
8
151221
9
1694723
10
29594446
11
404126228
12
10594925360
[1,1,2,6,30,156,1455,11300,151221,1694723, 29594446,404126228,10594925360]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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