A078044 Expansion of (1-x)/(1+x+2*x^3).

1, -2, 2, -4, 8, -12, 20, -36, 60, -100, 172, -292, 492, -836, 1420, -2404, 4076, -6916, 11724, -19876, 33708, -57156, 96908, -164324, 278636, -472452, 801100, -1358372, 2303276, -3905476, 6622220, -11228772, 19039724, -32284164, 54741708, -92821156, 157389484, -266872900

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• sign
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (-1,0,-2).

Crossrefs

Equals 4 * (-1)^n * A003476(n-2), n>2.

First differences of A077974.

Programs

PARI

Vec((1-x)/(1+x+2*x^3)+O(x^99)) \\ Charles R Greathouse IV, Sep 27 2012