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A062186 a(n) = a(n-1) - a(floor(n/2)), with a(1)=1. 2
1, 0, -1, -1, -1, 0, 1, 2, 3, 4, 5, 5, 5, 4, 3, 1, -1, -4, -7, -11, -15, -20, -25, -30, -35, -40, -45, -49, -53, -56, -59, -60, -61, -60, -59, -55, -51, -44, -37, -26, -15, 0, 15, 35, 55, 80, 105, 135, 165, 200, 235, 275, 315, 360, 405, 454, 503, 556, 609, 665, 721, 780, 839, 899, 959, 1020, 1081, 1141, 1201, 1260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

COMMENTS

Period of oscillations above and below the axis more than doubles at each cycle.

LINKS

Table of n, a(n) for n=1..70.

FORMULA

G.f.: A(x) satisfies: A(x) = (x - (1 + x)*A(x^2))/(1 - x). - Ilya Gutkovskiy, May 04 2019

EXAMPLE

a(14)=a(13)-a(7)=5-1=4.

a(15)=a(14)-a(7)=4-1=3.

CROSSREFS

Cf. A033485, A062187, A062188.

Sequence in context: A234470 A113771 A131845 * A085763 A273264 A281826

Adjacent sequences:  A062183 A062184 A062185 * A062187 A062188 A062189

KEYWORD

sign

AUTHOR

Henry Bottomley, Jun 13 2001

STATUS

approved

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Last modified September 21 00:17 EDT 2019. Contains 327252 sequences. (Running on oeis4.)