A204241 Permanent of the n-th principal submatrix of A204158.
1, 18, 457, 23672, 1894385, 222366990, 35787014405, 7577453436556, 2041650829418725, 682219727134076250, 276875111860035807025, 134154122874807259146080, 76495123111877275062902585, 50706144718387731766299555750
Offset: 1
Keywords
Programs
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Mathematica
f[i_, j_] := Max[3 i - 2 j, 3 j - 2 i]; m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}] TableForm[m[8]] (* 8x8 principal submatrix *) Flatten[Table[f[i, n + 1 - i], {n, 1, 12}, {i, 1, n}]] (* A204158 *) Table[Det[m[n]], {n, 1, 22}] (* A204240 *) Permanent[m_] := With[{a = Array[x, Length[m]]}, Coefficient[Times @@ (m.a), Times @@ a]]; Table[Permanent[m[n]], {n, 1, 14}] (* A204241 *)