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

1,2

Comments

Binomial transform gives A143100.

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

Links

Table of n, a(n) for n=1..79.

Formula

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

Mathematica

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

Crossrefs

Cf. A143097, A143100.

Sequence in context: A378283 A022303 A113189 * A225515 A265404 A274353

Adjacent sequences: A143095 A143096 A143097 * A143099 A143100 A143101

Keyword

sign,easy

Author

Gary W. Adamson, Jul 24 2008

Status

approved