A003287
formatted as a simple table:
n
a(n)
1
1
2
4
3
22
4
140
5
970
6
7196
7
56092
8
452064
9
3735700
10
31484244
11
269613896
12
2339571468
13
20529434520
[1,4,22,140,970,7196,56092,452064,3735700, 31484244,269613896,2339571468,20529434520]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
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