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A208340
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Triangle of coefficients of polynomials v(n,x) jointly generated with A202390; see the Formula section.
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4
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1, 2, 2, 3, 6, 3, 4, 13, 14, 5, 5, 24, 41, 30, 8, 6, 40, 96, 109, 60, 13, 7, 62, 196, 308, 262, 116, 21, 8, 91, 364, 743, 868, 590, 218, 34, 9, 128, 630, 1604, 2413, 2240, 1267, 402, 55, 10, 174, 1032, 3186, 5926, 7046, 5424, 2627, 730, 89, 11, 230, 1617
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OFFSET
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1,2
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COMMENTS
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v(n,n) = F(n+1), where F=A000045, the Fibonacci numbers.
Alternating row sums of v: (1,0,0,0,0,0,0,0,...).
As triangle T(n,k) with 0 <= k <= n, it is (2, -1/2, 1/2, 0, 0, 0, 0, 0, 0, 0, ...) DELTA (2, -1/2, -1/2, 0, 0, 0, 0, 0, 0, 0, ...) where DELTA is the operator defined in A084938.
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LINKS
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FORMULA
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u(n,x) = u(n-1,x) + x*v(n-1,x), v(n,x) = (x+1)*u(n-1,x) + (x+1)*v(n-1,x), where u(1,x)=1, v(1,x)=1.
As triangle T(n,k) with 0 <= k <= n:
T(n,k) = 2*T(n-1,k) + T(n-1,k-1) - T(n-2,k) + T(n-2,k-2) with T(0,0) = 1, T(1,0) = T(1,1) = 2 and T(n,k) = 0 if k < 0 or if k > n.
G.f.: (1+y*x)/(1-2*x-y*x+x^2-y^2*x^2).
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EXAMPLE
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First five rows:
1;
2, 2;
3, 6, 3;
4, 13, 14, 5;
5, 24, 41, 30, 8;
The first five polynomials v(n,x):
1
2 + 2x
3 + 6x + 3x^2
4 + 13x + 14x^2 + 5x^3
5 + 24x + 41x^2 + 30x^3 + 8x^4
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MATHEMATICA
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u[1, x_] := 1; v[1, x_] := 1; z = 13;
u[n_, x_] := u[n - 1, x] + x*v[n - 1, x];
v[n_, x_] := (x + 1)*u[n - 1, x] + (x + 1)*v[n - 1, x];
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]
Table[u[n, x] /. x -> 1, {n, 1, z}] (* u row sums *)
Table[v[n, x] /. x -> 1, {n, 1, z}] (* v row sums *)
Table[u[n, x] /. x -> -1, {n, 1, z}] (* u alt. row sums *)
Table[v[n, x] /. x -> -1, {n, 1, z}] (* v alt. row sums *)
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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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