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A009794 as a simple table

n a(n)
0 0
1 1
2 2
3 0
4 -8
5 12
6 168
7 -336
8 -6208
9 15760
10 365984
11 -1144704
12 -31759232
13 117385920
14 3799039104
15 -16206548736
16 -599327352832
17 2897776619776
18 120551382086144
19 -651455951990784
20 -30112348370954240
21 179856295521635328

[0,1,2,0,-8,12,168,-336,-6208,15760,365984,
 -1144704,-31759232,117385920,3799039104,
 -16206548736,-599327352832,2897776619776,
 120551382086144,-651455951990784,
 -30112348370954240,179856295521635328]

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Last modified May 16 13:17 EDT 2024. Contains 372552 sequences. (Running on oeis4.)