a(n) is the permanent of an n X n symmetric Toeplitz matrix M(n) whose first row consists of a single zero followed by successive positive integers repeated (A004526).

A332566

a(n) is the permanent of an n X n symmetric Toeplitz matrix M(n) whose first row consists of a single zero followed by successive positive integers repeated (A004526).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =16a(5) =150a(6) =2333a(7) =45840a(8) =1227816a(9) =40715300a(10) =1701223409a(11) =84902728550

External references