A000421
formatted as a simple table:
n
a(n)
1
1
2
2
3
6
4
20
5
91
6
509
7
3608
8
31856
9
340416
10
4269971
11
61133757
12
978098997
[1,2,6,20,91,509,3608,31856,340416,4269971, 61133757,978098997]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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