A204554 - OEIS

A204554

Permanent of the n-th principal submatrix of A204553.

1, 2, 13, 150, 2327, 49126, 1479844, 60008400, 2953395420, 175858256016, 12912316144776, 1147787177552928, 117448965142375680, 13797269352034003584, 1880027396323616236032

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

f[i_, j_] :=

Floor[(2 i + 2 j + 2)/4] - Floor[(i + j + 1)/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}]] (* A204553 *)

Permanent[m_] :=

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

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

Table[Permanent[m[n]], {n, 1, 15}] (* A204554 *)

CROSSREFS

Cf. A204553, A204551.

Sequence in context: A324464 A373179 A364339 * A069736 A363846 A058192

Adjacent sequences: A204551 A204552 A204553 * A204555 A204556 A204557

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 16 2012

STATUS

approved