A000175
formatted as a simple table:
n
a(n)
1
1
2
1
3
2
4
11
5
38
6
946
7
4580
8
202738
9
3786092
10
261868876
11
1992367192
12
2381255244240
[1,1,2,11,38,946,4580,202738,3786092,261868876, 1992367192,2381255244240]
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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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