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 A204255 Symmetric matrix given by f(i,j)=1+[(i+j) mod 4]. 2
 3, 4, 4, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Northwest corner: 3 4 1 2 3 4 1 2 4 1 2 3 4 1 2 3 1 2 3 4 1 2 3 4 2 3 4 1 2 3 4 1 3 4 1 2 3 4 1 2 4 1 2 3 4 1 2 3 MATHEMATICA f[i_, j_] := 1 + Mod[i + j, 4]; 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}]]  (* A204255 *) Permanent[m_] :=   With[{a = Array[x, Length[m]]},    Coefficient[Times @@ (m.a), Times @@ a]]; Table[Permanent[m[n]], {n, 1, 20}]    (* A204256 *) CROSSREFS Cf. A204256. Sequence in context: A260180 A057279 A054733 * A283753 A120649 A001009 Adjacent sequences:  A204252 A204253 A204254 * A204256 A204257 A204258 KEYWORD nonn,tabl AUTHOR Clark Kimberling, Jan 14 2012 STATUS approved

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Last modified October 23 22:15 EDT 2019. Contains 328373 sequences. (Running on oeis4.)