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A061655 as a simple table

na(n)
02
1-1
2-4
3-40
4-4960
5-147166720
6-299211527038566400
7-2703337074029927682081937523621232640

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