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A204241 Permanent of the n-th principal submatrix of A204158.

%I A204241 #6 Jul 12 2012 00:39:59
%S A204241 1,18,457,23672,1894385,222366990,35787014405,7577453436556,
%T A204241 2041650829418725,682219727134076250,276875111860035807025,
%U A204241 134154122874807259146080,76495123111877275062902585,50706144718387731766299555750
%N A204241 Permanent of the n-th principal submatrix of A204158.
%t A204241 f[i_, j_] := Max[3 i - 2 j, 3 j - 2 i];
%t A204241 m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
%t A204241 TableForm[m[8]] (* 8x8 principal submatrix *)
%t A204241 Flatten[Table[f[i, n + 1 - i],
%t A204241   {n, 1, 12}, {i, 1, n}]]     (* A204158 *)
%t A204241 Table[Det[m[n]], {n, 1, 22}]  (* A204240 *)
%t A204241 Permanent[m_] :=
%t A204241   With[{a = Array[x, Length[m]]},
%t A204241    Coefficient[Times @@ (m.a), Times @@ a]];
%t A204241 Table[Permanent[m[n]], {n, 1, 14}]  (* A204241 *)
%Y A204241 Cf. A204158, A204240.
%K A204241 nonn
%O A204241 1,2
%A A204241 _Clark Kimberling_, Jan 13 2012