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 A140326 Sign weighted matrices n X n:example {{2 w[2], w[0], w[1]}, {3 w[0], 2 w[1], w[2]}, {3 w[1], 3 w[2], 2 w[0]}} are made into monomials using w[n]=1 if n<>0, x if n==0. The coefficients of the monomials form a triangular sequence. 0
 1, 0, 2, -3, 0, 4, -12, 20, 0, -6, 24, -84, 73, 0, -12, 48, -256, 408, -216, 0, 18, -48, 480, -1328, 1464, -603, 0, 36, 0, 704, -3312, 5760, -4500, 1404, 0, -54, -192, 0, 4720, -15264, 20520, -13212, 3537, 0, -108, -768, 3584, 0, -26880, 62496, -64512, 33264, -7344, 0, 162, 1536, -12288, 29440, 0, -116256 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row sums: {1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1}. LINKS Table of n, a(n) for n=1..60. FORMULA Matrix: M(d)=(2 + Sign[n - m])*w[Mod[n + m, d]; If[n == 0, w[n] = x, w[n] = 1]; out_n,m=Coefficients[Det(M(d))) EXAMPLE {1}, {0, 2}, {-3, 0, 4}, {-12, 20, 0, -6}, {24, -84, 73, 0, -12}, {48, -256,408, -216, 0, 18}, {-48, 480, -1328, 1464, -603, 0, 36}, {0, 704, -3312, 5760, -4500,1404, 0, -54}, {-192, 0, 4720, -15264, 20520, -13212, 3537, 0, -108}, {-768, 3584, 0, -26880, 62496, -64512, 33264, -7344, 0, 162}, {1536, -12288, 29440, 0, -116256, 221760, -195552, 88560, -17523, 0, 324} MATHEMATICA M[d_] := Table[(2 + Sign[n - m])*w[Mod[n + m, d]], {n, 1, d}, {m, 1, d}]; a = Table[M[d], {d, 1, 10}]; Table[If[n == 0, w[n] = x, w[n] = 1], {n, 0, 10}]; Table[Det[a[[d]]], {d, 1, 10}]; a0 = Join[{{1}}, Table[CoefficientList[Det[a[[d]]], x], {d, 1, 10}]]; Flatten[a0] Table[Apply[Plus, CoefficientList[Det[a[[d]]], x]], {d, 1, 10}]; CROSSREFS Sequence in context: A363966 A258818 A261275 * A261781 A211402 A256064 Adjacent sequences: A140323 A140324 A140325 * A140327 A140328 A140329 KEYWORD uned,tabl,sign AUTHOR _Roger L. Bagula_ and _Gary W. Adamson_, May 26 2008 STATUS approved

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Last modified March 4 23:31 EST 2024. Contains 370537 sequences. (Running on oeis4.)