A204561 Permanent of the n-th principal submatrix of A204560.

1, 3, 26, 274, 4409, 100776, 3348056, 134046480, 6730452660, 416113787472, 32085045507600, 2844782901384192, 294773230519886592, 35411618960849142144, 4970308923985374563328, 778808458472330553255936

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Mathematica

f[i_, j_] :=
Floor[(2 i + 2 j + 4)/4] - Floor[(i + j + 2)/4];
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[8]] (* 8x8 principal submatrix *)
Flatten[Table[f[i, n + 1 - i],
  {n, 1, 14}, {i, 1, n}]]     (* A204560 *)
Permanent[m_] :=
  With[{a = Array[x, Length[m]]},
   Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 15}]  (* A204561 *)

Crossrefs

Cf. A204560, A204551.

Sequence in context: A300398 A048861 A053972 * A126738 A283298 A259610

Adjacent sequences: A204558 A204559 A204560 * A204562 A204563 A204564

Keyword

nonn

Author

Clark Kimberling, Jan 16 2012

Status

approved