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

Offset

1,2

Comments

Binomial transform = A143100: (1, 3, 4, 6, 13, 30, 64,...).

Links

Table of n, a(n) for n=1..72.

Formula

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

Crossrefs

Cf. A143097, A143100.

Sequence in context: A166332 A022303 A113189 * A225515 A265404 A274353

Adjacent sequences: A143095 A143096 A143097 * A143099 A143100 A143101

Keyword

sign

Author

Gary W. Adamson, Jul 24 2008

Status

approved