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A204554
Permanent of the n-th principal submatrix of A204553.
3
1, 2, 13, 150, 2327, 49126, 1479844, 60008400, 2953395420, 175858256016, 12912316144776, 1147787177552928, 117448965142375680, 13797269352034003584, 1880027396323616236032
OFFSET
1,2
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
Sequence in context: A324464 A373179 A364339 * A069736 A363846 A058192
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 16 2012
STATUS
approved