A204434 Permanent of the n-th principal submatrix of A204433.
0, 4, 9, 16, 192, 1032, 5184, 62496, 530712, 4188672, 61710336, 707802624, 7614259200, 133983590400, 1938416832000, 26579819520000, 544216485888000, 9509523337728000, 158654296829952000, 3711395156281344000
Offset: 1
Keywords
Programs
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Mathematica
f[i_, j_] := Mod[2 i + 2 j + 2, 3]; 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, 14}, {i, 1, n}]] (* A204433 *) Permanent[m_] := With[{a = Array[x, Length[m]]}, Coefficient[Times @@ (m.a), Times @@ a]]; Table[Permanent[m[n]], {n, 1, 22}] (* A204434 *)
Extensions
Typo in definition corrected by Georg Fischer, May 05 2022