A073974
formatted as a simple table:
n
a(n)
1
0
2
1
3
9
4
54
5
210
6
1008
7
6300
8
40824
9
262440
10
1679616
[0,1,9,54,210,1008,6300,40824,262440,1679616]
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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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