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 A204254 Permanent of the n-th principal submatrix of A204253. 2
 3, 7, 54, 466, 3732, 50928, 748224, 10421856, 204446592, 4232598624, 84204904320, 2154137877504, 57534363970560, 1488803964595200, 46983956781312000, 1536963329488896000, 48976637440702464000, 1838658764187353088000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..18. MATHEMATICA f[i_, j_] := 1 + Mod[i + j, 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, 12}, {i, 1, n}]] (* A204253 *) Permanent[m_] := With[{a = Array[x, Length[m]]}, Coefficient[Times @@ (m.a), Times @@ a]]; Table[Permanent[m[n]], {n, 1, 20}] (* A204254 *) CROSSREFS Cf. A204253. Sequence in context: A058023 A285065 A095124 * A144030 A228490 A130294 Adjacent sequences: A204251 A204252 A204253 * A204255 A204256 A204257 KEYWORD nonn AUTHOR Clark Kimberling, Jan 14 2012 STATUS approved

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Last modified December 7 05:34 EST 2023. Contains 367630 sequences. (Running on oeis4.)