A204234 - OEIS

A204234

Permanent of the n-th principal submatrix of A203990.

1, 2, 25, 1018, 97617, 18239786, 5881589105, 3009156161810, 2296768410595849, 2494959953768765810, 3716590842220109346457, 7367123790912343973015562, 18955419073428722394855382209, 61999496577719659890376379418138, 253245883804141341597229595842097313

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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}]