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A033312 formatted as a simple table:

n a(n)
0 0
1 0
2 1
3 5
4 23
5 119
6 719
7 5039
8 40319
9 362879
10 3628799
11 39916799
12 479001599
13 6227020799
14 87178291199
15 1307674367999
16 20922789887999
17 355687428095999
18 6402373705727999
19 121645100408831999
20 2432902008176639999

[0,0,1,5,23,119,719,5039,40319,362879,3628799,
 39916799,479001599,6227020799,87178291199,
 1307674367999,20922789887999,355687428095999,
 6402373705727999,121645100408831999,
 2432902008176639999]

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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