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A137696
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Triangular sequence of coefficients from a polynomial recursion: p(x,n)=p(x,Floor[(n-1)/2])-x^2*p(x,n-3)+x.
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0
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1, 0, 1, 0, 1, 1, 0, 2, -1, 0, 2, 0, -1, 0, 2, 1, -1, -1, 0, 2, 1, -2, 1, 0, 3, -1, -2, 0, 1, 0, 3, -1, -2, -1, 1, 1, 0, 3, 0, -3, -1, 2, -1, 0, 3, 0, -4, 1, 2, 0, -1
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OFFSET
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1,8
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COMMENTS
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Row sums are: {1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 1, ...}
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LINKS
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FORMULA
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p(x,n)=p(x,Floor[(n-1)/2])-x^2*p(x,n-3)+x; out_n,m=Coefficient(p(x,n)).
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EXAMPLE
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{1},
{0, 1},
{0, 1, 1},
{0, 2, -1},
{0, 2, 0, -1},
{0, 2, 1, -1, -1},
{0, 2, 1, -2, 1},
{0, 3, -1, -2, 0, 1},
{0, 3, -1, -2, -1,1, 1},
{0, 3, 0, -3, -1, 2, -1},
{0, 3, 0, -4, 1, 2, 0, -1}
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MATHEMATICA
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Clear[p, x]; p[x, -1] = 0; p[x, 0] = 1; p[x, 1] = x; p[x, 2] = x^2 + x; p[x_, n_] := p[x, n] = p[x, Floor[(n - 1)/2]] - x^2*p[x, n - 3] + x; Table[ExpandAll[p[x, n]], {n, 0, 10}]; a = Table[CoefficientList[p[x, n], x], {n, 0, 10}]; Flatten[a] Table[Apply[Plus, CoefficientList[p[x, n], x]], {n, 0, 10}];
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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