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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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