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A204426
Permanent of the n-th principal submatrix of A204425.
3
1, 1, 9, 34, 132, 1032, 6936, 51912, 530712, 5005152, 53529984, 707802624, 8714718720, 119716185600, 1938416832000, 29588291712000, 496487584512000, 9509523337728000, 173318541516288000, 3434389946233344000
OFFSET
1,3
MATHEMATICA
f[i_, j_] := Mod[2 i + j + 1, 3];
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}]] (* A204425 *)
Permanent[m_] :=
With[{a = Array[x, Length[m]]},
Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 22}] (* A204426 *)
CROSSREFS
Sequence in context: A250763 A264678 A050478 * A154393 A119389 A197273
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 15 2012
STATUS
approved