A204251 Permanent of the n-th principal submatrix of A204250.

1, 15, 696, 70380, 13028148, 3964560012, 1842113636352, 1238025608824896, 1154488823507833920, 1445382306218202517440, 2365159362652507207703040, 4947087474421921107685036800, 12980259416603230936506795674880

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Mathematica

f[i_, j_] := i*j + i + j - 2;
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[5]] (* 5x5 principal submatrix *)
Flatten[Table[f[i, n + 1 - i],
  {n, 1, 12}, {i, 1, n}]]      (* A204250 *)
Permanent[m_] :=
  With[{a = Array[x, Length[m]]},
   Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 14}]  (* A204251 *)

Crossrefs

Cf. A204250.

Sequence in context: A001520 A062079 A062032 * A281764 A209740 A209461

Adjacent sequences: A204248 A204249 A204250 * A204252 A204253 A204254

Keyword

nonn

Author

Clark Kimberling, Jan 14 2012

Status

approved