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

1,2

LINKS

Table of n, a(n) for n=1..16.

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

Cf. A204562, A204551.

Sequence in context: A084270 A284195 A053677 * A196449 A281262 A186196

Adjacent sequences:  A204560 A204561 A204562 * A204564 A204565 A204566

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 16 2012

STATUS

approved

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Last modified November 18 19:59 EST 2019. Contains 329288 sequences. (Running on oeis4.)