A002521
formatted as a simple table:
n
a(n)
0
1
1
0
2
0
3
2184
4
78624
5
768096
6
2159976
7
1555632
8
216216
9
2240
[1,0,0,2184,78624,768096,2159976,1555632,216216, 2240]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
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