A105370 -id:A105370 - cp's OEIS frontend

A105367 Expansion of (1-x^3)/(1-x^5).

1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0, 0, -1, 0, 1, 0

Offset: 0

Paul Barry, Apr 01 2005

Periodic {1,0,0,-1,0}. Partial sums of A105368. Binomial transform of A105370.

Index entries for linear recurrences with constant coefficients, signature (-1,-1,-1,-1).

G.f.: (1+x+x^2)/(1+x+x^2+x^3+x^4);

a(n) = sqrt(2/5 - 2*sqrt(5)/25)*cos(4*Pi*n/5 + 3*Pi/10) + sqrt(2/5 + 2*sqrt(5)/25)*sin(2*Pi*n/5 + 2*Pi/5).

A105369 Expansion of ((1+x)^3 - x^3)/((1+x)^5 - x^5).

Original entry on oeis.org

1, -2, 3, -5, 10, -20, 35, -50, 50, 0, -175, 625, -1625, 3625, -7250, 13125, -21250, 29375, -29375, 0, 106250, -384375, 1006250, -2250000, 4500000, -8140625, 13171875, -18203125, 18203125, 0, -65859375, 238281250, -623828125, 1394921875, -2789843750, 5046875000, -8166015625

Offset: 0

Paul Barry, Apr 01 2005

Consecutive pair sums gives A105370.

Index entries for linear recurrences with constant coefficients, signature (-5,-10,-10,-5)

G.f.: (1 + 3*x + 3*x^2)/(1 + 5*x + 10*x^2 + 10*x^3 + 5*x^4);

a(n) = 2*sqrt(5)*(5/2 - sqrt(5)/2)^(n/2)*cos(7*Pi*n/10 + Pi/5)/5 + 2*sqrt(5)*(5/2 + sqrt(5)/2)^(n/2)*cos(9*Pi*n/10 + 2*Pi*/5)/5.

cp's OEIS Frontend

A105367 Expansion of (1-x^3)/(1-x^5).

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