A143098 First differences of A143097.

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

Offset: 1

Author

Gary W. Adamson, Jul 24 2008

Keywords

• sign
• easy

Comments

Binomial transform gives A143100.

1 followed by {2, -1, 2} repeated. - Amiram Eldar, Jun 02 2025

Crossrefs

Cf. A143097, A143100.

Programs

Mathematica

Join[{1}, Flatten[Table[{2, -1, 2}, {33}]]] (* Amiram Eldar, Jun 02 2025 *)

Formula

G.f.: x(1+2x-x^2+x^3)/((1-x)(1+x+x^2)). - R. J. Mathar, Sep 06 2008