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A210739
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Triangle of coefficients of polynomials u(n,x) jointly generated with A210740; see the Formula section.
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3
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1, 1, 3, 1, 4, 8, 1, 4, 14, 21, 1, 4, 15, 46, 55, 1, 4, 15, 55, 145, 144, 1, 4, 15, 56, 196, 444, 377, 1, 4, 15, 56, 208, 678, 1331, 987, 1, 4, 15, 56, 209, 764, 2282, 3926, 2584, 1, 4, 15, 56, 209, 779, 2762, 7499, 11434, 6765, 1, 4, 15, 56, 209, 780, 2892
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OFFSET
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1,3
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COMMENTS
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Rows end with even-indexed Fibonacci numbers
Alternating row sums: A000975 (signed)
For a discussion and guide to related arrays, see A208510.
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LINKS
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FORMULA
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u(n,x)=2x*u(n-1,x)+x*v(n-1,x)+1,
v(n,x)=(x+1)*u(n-1,x)+x*v(n-1,x)+1,
where u(1,x)=1, v(1,x)=1.
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EXAMPLE
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u(n,x)=2x*u(n-1,x)+x*v(n-1,x)+1,
v(n,x)=(x+1)*u(n-1,x)+x*v(n-1,x)+1,
where u(1,x)=1, v(1,x)=1.
First five rows:
1
1...3
1...4...8
1...4...14...21
1...4...15...46...55
First three polynomials u(n,x): 1, 1+ 3x, 1 + 4x + 8x^2.
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MATHEMATICA
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u[1, x_] := 1; v[1, x_] := 1; z = 16;
u[n_, x_] := 2 x*u[n - 1, x] + x*v[n - 1, x] + 1;
v[n_, x_] := (x + 1)*u[n - 1, x] + x*v[n - 1, x] + 1;
Table[Expand[u[n, x]], {n, 1, z/2}]
Table[Expand[v[n, x]], {n, 1, z/2}]
cu = Table[CoefficientList[u[n, x], x], {n, 1, z}];
TableForm[cu]
Table[Expand[v[n, x]], {n, 1, z}]
cv = Table[CoefficientList[v[n, x], x], {n, 1, z}];
TableForm[cv]
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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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