a(n) gives the determinant of a bisymmetric n X n matrix involving the entries 1, 2, ..., A002620(n+1).

A259056

a(n) gives the determinant of a bisymmetric n X n matrix involving the entries 1, 2, ..., A002620(n+1).

Terms

    a(0) =1a(1) =-3a(2) =-16a(3) =60a(4) =384a(5) =-1680a(6) =-12288a(7) =60480a(8) =491520a(9) =-2661120a(10) =-23592960a(11) =138378240a(12) =1321205760a(13) =-8302694400a(14) =-84557168640a(15) =564583219200

External references