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A135864 as a simple table

n a(n)
0 1
1 9
2 27
3 0
4 -81
5 243
6 0
7 -2916
8 10935
9 0
10 -168399
11 682344
12 0
13 -11711385
14 49364964
15 0
16 -900438201
17 3887490915
18 0
19 -73729998576
20 323480165085
21 0
22 -6303914878248
23 27978933759300
24 0
25 -556251967191492
26 2490404893915293
27 0
28 -50276620111538700
29 226626845346291663
30 0

[1,9,27,0,-81,243,0,-2916,10935,0,-168399,682344,
 0,-11711385,49364964,0,-900438201,3887490915,0,
 -73729998576,323480165085,0,-6303914878248,
 27978933759300,0,-556251967191492,
 2490404893915293,0,-50276620111538700,
 226626845346291663,0]

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Last modified May 23 10:15 EDT 2013. Contains 225587 sequences.