A001251
formatted as a simple table:
n
a(n)
3
2
4
12
5
70
6
442
7
3108
8
24216
9
208586
10
1972904
11
20373338
12
228346522
13
2763259364
14
35927135944
[2,12,70,442,3108,24216,208586,1972904,20373338, 228346522,2763259364,35927135944]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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