A204548 - OEIS

%I #6 Jul 12 2012 00:39:59

%S 0,0,1,2,4,8,72,288,864,3456,35424,212544,1088640,6220800,75064320,

%T 600514560,4147200000,31684608000,440681472000,4406814720000,

%U 39103948800000,373098700800000

%N Permanent of the n-th principal submatrix of A204547.

%t f[i_, j_] := Floor[(i + j + 4)/4] - Floor[(i + j + 2)/4];

%t m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]

%t TableForm[m[8]] (* 8x8 principal submatrix *)

%t Flatten[Table[f[i, n + 1 - i],

%t   {n, 1, 14}, {i, 1, n}]]       (* A204547 *)

%t Permanent[m_] :=

%t   With[{a = Array[x, Length[m]]},

%t    Coefficient[Times @@ (m.a), Times @@ a]];

%t Table[Permanent[m[n]], {n, 1, 22}]   (* A204548 *)

%Y Cf. A204547, A204269.

%K nonn

%O 1,4

%A _Clark Kimberling_, Jan 16 2012