A078047 Expansion of (1-x)/(1+x+x^2+2*x^3).

1, -2, 1, -1, 4, -5, 3, -6, 13, -13, 12, -25, 39, -38, 49, -89, 116, -125, 187, -294, 357, -437, 668, -945, 1151, -1542, 2281, -3041, 3844, -5365, 7603, -9926, 13053, -18333, 25132, -32905, 44439, -61798, 83169, -110249, 150676, -206765, 276587, -371174, 508117, -690117, 924348, -1250465

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• sign
• easy

Links

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

Crossrefs

First differences of A077976.

Programs

PARI

Vec((1-x)/(1+x+x^2+2*x^3) + O(x^50)) \\ Jinyuan Wang, Apr 07 2020