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A006990 formatted as a simple table:

n a(n)
2 2
3 5
4 23
5 113
6 719
7 5039
8 40289
9 362867
10 3628789
11 39916787
12 479001599
13 6227020777
14 87178291199
15 1307674367953
16 20922789887947
17 355687428095941
18 6402373705727959
19 121645100408831899
20 2432902008176639969

[2,5,23,113,719,5039,40289,362867,3628789,
 39916787,479001599,6227020777,87178291199,
 1307674367953,20922789887947,355687428095941,
 6402373705727959,121645100408831899,
 2432902008176639969]

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.


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