a(n) = neg(M(n)), where M(n) is the n X n left circulant matrix with (row 1) = (1, 2, ... , n), and neg(M(n)) is the negative part of the determinant of M(n); see A380661.

A383774

a(n) = neg(M(n)), where M(n) is the n X n left circulant matrix with (row 1) = (1, 2, ... , n), and neg(M(n)) is the negative part of the determinant of M(n); see A380661.

Terms

    a(0) =0a(1) =-4a(2) =-36a(3) =-450a(4) =-15675a(5) =-772122a(6) =-47753440a(7) =-3909436192a(8) =-410168886615

External references