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A204234
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Permanent of the n-th principal submatrix of A203990.
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1
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1, 2, 25, 1018, 97617, 18239786, 5881589105, 3009156161810, 2296768410595849, 2494959953768765810, 3716590842220109346457, 7367123790912343973015562, 18955419073428722394855382209, 61999496577719659890376379418138, 253245883804141341597229595842097313
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OFFSET
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0,2
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LINKS
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MAPLE
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with(LinearAlgebra):
a:= n-> `if`(n=0, 1, Permanent(Matrix(n, (i, j)-> (i+j)*min(i, j)))):
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(0)=1 prepended and one more term added by Alois P. Heinz, Nov 14 2016
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STATUS
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approved
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