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A009520 as a simple table

n a(n)
0 1
1 -4
2 68
3 -2528
4 160400
5 -15384128
6 2066458176
7 -369136141824
8 84457146691840
9 -24053254928131072
10 8337440272897836032
11 -3453890669994608320512
12 1684467809557949759983616
13 -954970518105094229423833088

[1,-4,68,-2528,160400,-15384128,2066458176,
 -369136141824,84457146691840,-24053254928131072,
 8337440272897836032,-3453890669994608320512,
 1684467809557949759983616,
 -954970518105094229423833088]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)