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A139548
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Triangle T(n,k) with the coefficient of [x^k] of the polynomial (2*(x+1)^2)^n in row n, column k, 0<=k<=2n.
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1
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1, 2, 4, 2, 4, 16, 24, 16, 4, 8, 48, 120, 160, 120, 48, 8, 16, 128, 448, 896, 1120, 896, 448, 128, 16, 32, 320, 1440, 3840, 6720, 8064, 6720, 3840, 1440, 320, 32, 64, 768, 4224, 14080, 31680, 50688, 59136, 50688, 31680, 14080, 4224, 768, 64, 128, 1792, 11648
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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1;
2, 4, 2;
4, 16, 24, 16, 4;
8, 48, 120, 160, 120, 48, 8;
16, 128, 448, 896, 1120, 896, 448, 128, 16;
32, 320, 1440, 3840, 6720, 8064, 6720, 3840, 1440, 320, 32;
64, 768, 4224, 14080, 31680, 50688, 59136, 50688, 31680, 14080, 4224, 768, 64;
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MATHEMATICA
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Clear[f, x, n] f[x_, y_, n_] = Sum[Binomial[n, i]*x^i*y^(n - i), {i, 0, n}]; Table[ExpandAll[f[x, y, n]*f[y, z, n]*f[x, z, n]], {n, 0, 10}]; a = Table[CoefficientList[ExpandAll[f[x, y, n]*f[y, z, n]*f[x, z, n]] /. y -> 1 /. z -> 1, x], {n, 0, 10}]; Flatten[a]
(* Second program: *)
Table[2^n*Binomial[2 n, k], {n, 0, 7}, {k, 0, 2 n}] // Flatten (* Michael De Vlieger, May 16 2018 *)
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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