login
A204563
Permanent of the n-th principal submatrix of A204562.
3
1, 6, 40, 462, 7907, 206846, 6670844, 277121424, 14390352620, 947692403880, 72583382625408, 6575489103737088, 696011636400194304, 86805454700886653952, 12166531324546826156544, 1933901484265841951655936
OFFSET
1,2
MATHEMATICA
f[i_, j_] :=
Floor[(2 i + 2 j + 6)/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}]] (* A204562 *)
Permanent[m_] :=
With[{a = Array[x, Length[m]]},
Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 17}] (* A204563 *)
CROSSREFS
Sequence in context: A084270 A284195 A053677 * A356540 A374867 A196449
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 16 2012
STATUS
approved