Number of negative terms in a symmetric determinant of order n.

A059424

Number of negative terms in a symmetric determinant of order n.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =3a(4) =9a(5) =35a(6) =195a(7) =1218a(8) =9184a(9) =75492a(10) =724995a(11) =7428905a(12) =86414559a(13) =1059030297a(14) =14455096201a(15) =206132138310

External references