A055551
formatted as a simple table:
n
a(n)
1
0
2
0
3
1
4
12
5
36
6
114
7
375
8
1071
9
2939
10
7706
11
20417
12
53332
13
124882
[0,0,1,12,36,114,375,1071,2939,7706,20417,53332, 124882]
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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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