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A190610
a(1)=a(2)=1; thereafter a(n) = a(ceiling(n/2))-a(floor(n/2)).
3
1, 1, 0, 0, -1, 0, 0, 0, -1, 0, 1, 0, 0, 0, 0, 0, -1, 0, 1, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, 0, 1, 0, -1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, 0, 1, 0, -1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, -1, 0, 1, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0
OFFSET
1,1
MAPLE
f:=proc(n) option remember; local r; r:=1;
if n <= 2 then 1 else r*(f(ceil(n/2))-f(floor(n/2))); fi; end;
CROSSREFS
Sequence in context: A127239 A129186 A353494 * A095901 A374036 A087049
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