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A204548 Permanent of the n-th principal submatrix of A204547. 3
0, 0, 1, 2, 4, 8, 72, 288, 864, 3456, 35424, 212544, 1088640, 6220800, 75064320, 600514560, 4147200000, 31684608000, 440681472000, 4406814720000, 39103948800000, 373098700800000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..22.

MATHEMATICA

f[i_, j_] := Floor[(i + 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}]]       (* A204547 *)

Permanent[m_] :=

  With[{a = Array[x, Length[m]]},

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

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

CROSSREFS

Cf. A204547, A204269.

Sequence in context: A018507 A018523 A261714 * A018532 A270381 A099280

Adjacent sequences:  A204545 A204546 A204547 * A204549 A204550 A204551

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 16 2012

STATUS

approved

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Last modified December 13 17:17 EST 2019. Contains 329970 sequences. (Running on oeis4.)