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A117964 A117963 mod 2. 1
1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(3n+2)=0, a(3n)=a(3n+1). a(3n) may be equal to A088917(n).

LINKS

Table of n, a(n) for n=0..99.

FORMULA

a(n)=sum{k=0..floor(n/2), L(C(n-k,k)/3)} mod 2 where L(j/p) is the Legendre symbol of j and p.

CROSSREFS

Sequence in context: A232714 A274179 A194675 * A179020 A179771 A194677

Adjacent sequences:  A117961 A117962 A117963 * A117965 A117966 A117967

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Apr 05 2006

STATUS

approved

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Last modified January 17 23:15 EST 2019. Contains 319251 sequences. (Running on oeis4.)