A003496
formatted as a simple table:
n
a(n)
0
1
1
6
2
18
3
132
4
810
5
5724
6
42156
7
323352
8
2550042
9
20559660
10
168680196
[1,6,18,132,810,5724,42156,323352,2550042, 20559660,168680196]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
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