A077927 Expansion of (1-x)^(-1)/(1+2*x+2*x^3).

1, -1, 3, -7, 17, -39, 93, -219, 517, -1219, 2877, -6787, 16013, -37779, 89133, -210291, 496141, -1170547, 2761677, -6515635, 15372365, -36268083, 85567437, -201879603, 476295373, -1123725619, 2651210445, -6255011635, 14757474509, -34817369907, 82144763085, -193804475187

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• sign
• easy

Links

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

Formula

a(n) = -a(n-1) + 2 a(n-2) - 2 a(n-3) + 2 a(n-4) - N-E. Fahssi, Mar 29 2008

a(n) -a(n-1) = (-1)^(n+1)*A052912(n). - R. J. Mathar, Jul 08 2022