The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,1); a(0)=a(1)=1.

A336114

The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,1); a(0)=a(1)=1.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =64a(4) =930a(5) =17088a(6) =380870a(7) =9992064a(8) =301738626a(9) =10310669440a(10) =393355695942

External references