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A009620 as a simple table

n a(n)
0 1
1 -2
2 -44
3 -944
4 -27632
5 -975072
6 -27882048
7 1986004224
8 850359527680
9 222801125934592
10 57863671042155520
11 16141663294163980288
12 4939136307747239694336
13 1663039626931665431732224

[1,-2,-44,-944,-27632,-975072,-27882048,
 1986004224,850359527680,222801125934592,
 57863671042155520,16141663294163980288,
 4939136307747239694336,1663039626931665431732224]

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Last modified April 24 18:05 EDT 2024. Contains 371962 sequences. (Running on oeis4.)