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A009795 as a simple table

n a(n)
0 0
1 2
2 -16
3 288
4 -10368
5 610304
6 -52885504
7 6324756480
8 -997700468736
9 200677417680896
10 -50126593037172736
11 15222954297995034624
12 -5523668414636262162432
13 2360101997206034337234944
14 -1172849951576110533537955840
15 670735996458876867872135577600

[0,2,-16,288,-10368,610304,-52885504,6324756480,
 -997700468736,200677417680896,-50126593037172736,
 15222954297995034624,-5523668414636262162432,
 2360101997206034337234944,
 -1172849951576110533537955840,
 670735996458876867872135577600]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)