A001933
formatted as a simple table:
n
a(n)
1
2
2
1
3
4
4
7
5
24
6
62
7
216
8
710
9
2570
10
9215
11
34146
12
126853
13
477182
[2,1,4,7,24,62,216,710,2570,9215,34146,126853, 477182]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
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