A204424 - OEIS

A204424

Permanent of the n-th principal submatrix of A204423.

0, 2, 9, 16, 144, 1032, 5184, 48816, 530712, 4188672, 50015232, 707802624, 7614259200, 112586112000, 1938416832000, 26579819520000, 469224244224000, 9509523337728000, 158654296829952000, 3261008730405888000

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

MATHEMATICA

f[i_, j_] := Mod[2 i + j, 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}]] (* A204423 *)

Permanent[m_] :=

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

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

Table[Permanent[m[n]], {n, 1, 22}] * A204424 *)

CROSSREFS

Cf. A204223, A204263.

Sequence in context: A369647 A078707 A085332 * A062981 A069622 A334193

Adjacent sequences: A204421 A204422 A204423 * A204425 A204426 A204427

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 15 2012

STATUS

approved