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A061655 as a simple table

n a(n)
0 2
1 -1
2 -4
3 -40
4 -4960
5 -147166720
6 -299211527038566400
7 -2703337074029927682081937523621232640

[2,-1,-4,-40,-4960,-147166720,-299211527038566400,
 -2703337074029927682081937523621232640]

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)