A006568
formatted as a simple table:
n
a(n)
0
1
1
3
2
18
3
90
4
270
5
1134
6
5670
7
2430
8
7290
9
133650
10
112266
11
1990170
12
9950850
13
2296350
14
984150
[1,3,18,90,270,1134,5670,2430,7290,133650,112266, 1990170,9950850,2296350,984150]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
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