0,4

Another permutation of the integers is -A130526.

Table of n, a(n) for n=0..68.

a(0) = 0; a(n)=k if n=L(k); a(n)=-k if n=U(k), where L(k) = A000201(k)=Floor(n*phi) = Lower Wythoff sequence, U(k) = A001950(k) = k+L(k) = Upper Wythoff sequence.

6=L(4), so a(6)=4.

7=U(3), so a(7)=-3.

Cf. A000201, A001950, A026242, A130527.

Sequence in context: A214371 A026338 A026242 * A174523 A261172 A134834

Adjacent sequences: A130523 A130524 A130525 * A130527 A130528 A130529

sign

Clark Kimberling, Jun 02 2007

approved