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A204234 Permanent of the n-th principal submatrix of A203990. 1
1, 2, 25, 1018, 97617, 18239786, 5881589105, 3009156161810, 2296768410595849, 2494959953768765810, 3716590842220109346457, 7367123790912343973015562, 18955419073428722394855382209, 61999496577719659890376379418138, 253245883804141341597229595842097313 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

MAPLE

with(LinearAlgebra):

a:= n-> `if`(n=0, 1, Permanent(Matrix(n, (i, j)-> (i+j)*min(i, j)))):

seq(a(n), n=0..16);  # Alois P. Heinz, Nov 14 2016

MATHEMATICA

f[i_, j_] := (i + j) Min[i, j];  (* A203990 *)

m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]

Table[Det[m[n]], {n, 1, 22}]  (* A114160 *)

Permanent[m_] :=

  With[{a = Array[x, Length[m]]},

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

Table[Permanent[m[n]], {n, 1, 14}]  (* A204234 *)

CROSSREFS

Cf. A203990.

Sequence in context: A273545 A014050 A015214 * A203747 A278273 A210836

Adjacent sequences:  A204231 A204232 A204233 * A204235 A204236 A204237

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 13 2012

EXTENSIONS

a(0)=1 prepended and one more term added by Alois P. Heinz, Nov 14 2016

STATUS

approved

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Last modified October 22 07:53 EDT 2021. Contains 348160 sequences. (Running on oeis4.)