A057734
formatted as a simple table:
n
a(n)
1
1
2
2
3
4
4
10
5
24
6
66
7
180
8
522
9
1532
10
4984
[1,2,4,10,24,66,180,522,1532,4984]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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