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A204550
Permanent of the n-th principal submatrix of A204549.
3
0, 1, 1, 2, 4, 20, 72, 288, 864, 6624, 35424, 212544, 1088640, 10056960, 75064320, 600514560, 4147200000, 46664294400, 440681472000, 4406814720000, 39103948800000, 515545067520000
OFFSET
1,4
MATHEMATICA
f[i_, j_] :=
Floor[(i + j + 5)/4] - Floor[(i + j + 3)/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}]] (* A204549 *)
Permanent[m_] :=
With[{a = Array[x, Length[m]]},
Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 22}] (* A204550 *)
CROSSREFS
Sequence in context: A192377 A286344 A279153 * A009291 A081440 A204438
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 16 2012
STATUS
approved