A006820
formatted as a simple table:
n
a(n)
5
1
6
1
7
2
8
6
9
16
10
59
11
265
12
1544
13
10778
14
88168
15
805491
16
8037418
17
86221634
18
985870522
19
11946487647
20
152808063181
[1,1,2,6,16,59,265,1544,10778,88168,805491, 8037418,86221634,985870522,11946487647, 152808063181]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 11 12:57 EST 2009. Contains 170656 sequences.
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