A115525 Periodic {1,1,-2,0,1,0,-1,0,0,1,-1,-1}.

1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1, 1, 1, -2, 0, 1, 0, -1, 0, 0, 1, -1, -1

Offset: 0

Author

Paul Barry, Jan 25 2006

Keywords

• easy
• sign

Comments

Diagonal sums of number triangle A115524.

Links

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

Programs

Mathematica

PadRight[{},120,{1,1,-2,0,1,0,-1,0,0,1,-1,-1}] (* Harvey P. Dale, Aug 20 2021 *)

Formula

G.f.: (1+2x-x^3-2x^4-x^5)/(1+x+x^2-x^4-x^5-x^6).