A001423
formatted as a simple table:
n
a(n)
0
1
1
1
2
4
3
18
4
126
5
1160
6
15973
7
836021
8
1843120128
[1,1,4,18,126,1160,15973,836021,1843120128]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 9 18:50 EST 2009. Contains 170568 sequences.
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