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A009556 formatted as a simple table:

n a(n)
0 1
1 2
2 -24
3 104
4 5824
5 -385408
6 15920256
7 -160063744
8 -67251703808
9 9821117788160
10 -551206277726208
11 -106679023552528384
12 37135946330613907456
13 -2111279822539107794944
14 -3285803845056084678279168

[1,2,-24,104,5824,-385408,15920256,-160063744,
 -67251703808,9821117788160,-551206277726208,
 -106679023552528384,37135946330613907456,
 -2111279822539107794944,
 -3285803845056084678279168]

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.


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