A137412 - OEIS

A137412

a(1)=0. If a(m) is odd, then a(2^(m-1)+k) = a(k)-1, for all k where 1<=k<=2^(m-1). If a(m) is even, then a(2^(m-1)+k) = a(k)+1, for all k where 1<=k<=2^(m-1).

0, 1, -1, 0, -1, 0, -2, -1, 1, 2, 0, 1, 0, 1, -1, 0, -1, 0, -2, -1, -2, -1, -3, -2, 0, 1, -1, 0, -1, 0, -2, -1, 1, 2, 0, 1, 0, 1, -1, 0, 2, 3, 1, 2, 1, 2, 0, 1, 0, 1, -1, 0, -1, 0, -2, -1, 1, 2, 0, 1, 0, 1, -1, 0, 1, 2, 0, 1, 0, 1, -1, 0, 2, 3, 1, 2, 1, 2, 0, 1, 0, 1, -1, 0, -1, 0, -2, -1, 1, 2, 0, 1, 0, 1, -1, 0, 2, 3, 1, 2, 1, 2, 0, 1, 3, 4, 2, 3, 2, 3, 1, 2, 1, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..114.

FORMULA

a(n) = 1 - A104145(n). - Leroy Quet, Apr 22 2008

EXAMPLE

Starting with a(1) = 1 instead gets sequence A104145.

CROSSREFS

Cf. A104145.

Sequence in context: A236074 A099916 A099917 * A355913 A373605 A025925

Adjacent sequences: A137409 A137410 A137411 * A137413 A137414 A137415

KEYWORD

easy,sign

AUTHOR

Leroy Quet, Apr 15 2008

STATUS

approved