Voozh

A143431

Periodic length 8 sequence [1, -1, 1, -1, -1, 1, -1, 1, ...].

1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1

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OFFSET

0,1

COMMENTS

Nonsimple continued fraction expansion of (1+sqrt 5)/2= A001622. - R. J. Mathar, Mar 08 2012

LINKS

Table of n, a(n) for n=0..101.

FORMULA

Euler transform of length 8 sequence [ -1, 1, 0, -2, 0, 0, 0, 1].

a(-1 - n) = a(n). a(n + 4) = - a(n).

G.f.: (1 - x) * (1 + x^2) / (1 + x^4).

EXAMPLE