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A204251 Permanent of the n-th principal submatrix of A204250.

%I A204251 #6 Jul 12 2012 00:39:59
%S A204251 1,15,696,70380,13028148,3964560012,1842113636352,1238025608824896,
%T A204251 1154488823507833920,1445382306218202517440,2365159362652507207703040,
%U A204251 4947087474421921107685036800,12980259416603230936506795674880
%N A204251 Permanent of the n-th principal submatrix of A204250.
%t A204251 f[i_, j_] := i*j + i + j - 2;
%t A204251 m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
%t A204251 TableForm[m[5]] (* 5x5 principal submatrix *)
%t A204251 Flatten[Table[f[i, n + 1 - i],
%t A204251   {n, 1, 12}, {i, 1, n}]]      (* A204250 *)
%t A204251 Permanent[m_] :=
%t A204251   With[{a = Array[x, Length[m]]},
%t A204251    Coefficient[Times @@ (m.a), Times @@ a]];
%t A204251 Table[Permanent[m[n]], {n, 1, 14}]  (* A204251 *)
%Y A204251 Cf. A204250.
%K A204251 nonn
%O A204251 1,2
%A A204251 _Clark Kimberling_, Jan 14 2012