A064151
formatted as a simple table:
n
a(n)
1
0
2
2
3
9
4
54
5
445
6
4821
7
65685
8
1077871
9
20700806
10
455052511
11
11262113374
12
309787170203
[0,2,9,54,445,4821,65685,1077871,20700806, 455052511,11262113374,309787170203]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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