A190608 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A190608

a(1)=a(2)=1; thereafter a(n) = 2*(a(ceiling(n/2))-a(floor(n/2))).

1, 1, 0, 0, -2, 0, 0, 0, -4, 0, 4, 0, 0, 0, 0, 0, -8, 0, 8, 0, 8, 0, -8, 0, 0, 0, 0, 0, 0, 0, 0, 0, -16, 0, 16, 0, 16, 0, -16, 0, 16, 0, -16, 0, -16, 0, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -32, 0, 32, 0, 32, 0, -32, 0, 32, 0, -32, 0, -32, 0, 32, 0, 32, 0, -32, 0, -32, 0, 32, 0, -32, 0, 32, 0, 32 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,5`
	LINKS	`Table of n, a(n) for n=1..93.`
	MAPLE	`f:=proc(n) option remember; local r; r:=2;` `if n <= 2 then 1 else r*(f(ceil(n/2))-f(floor(n/2))); fi; end;`
	CROSSREFS	`Cf. A190609, A190610.` `Sequence in context: A348616 A348613 A285182 * A011991 A234931 A129183` `Adjacent sequences: A190605 A190606 A190607 * A190609 A190610 A190611`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane, May 13 2011, based on a posting by Benoit CLOITRE to the Sequence Fans Mailing List, Apr 29 2011`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 26 04:58 EDT 2023. Contains 361529 sequences. (Running on oeis4.)