A002406
formatted as a simple table:
n
a(n)
0
1
1
8
2
15
3
212
4
865
5
31560
6
397285
7
8760472
8
73512810
9
7619823960
[1,8,15,212,865,31560,397285,8760472,73512810, 7619823960]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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