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A102395 A mod 2 related Jacobsthal sequence. 2
1, 0, 0, 2, 0, 2, 2, 2, 0, 2, 2, 2, 2, 2, 2, 6, 0, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 6, 2, 6, 6, 10, 0, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 6, 2, 6, 6, 10, 2, 2, 2, 6, 2, 6, 6, 10, 2, 6, 6, 10, 6, 10, 10, 22, 0, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 6, 2, 6, 6, 10, 2, 2, 2, 6, 2, 6, 6, 10, 2, 6, 6, 10, 6, 10, 10, 22, 2, 2, 2 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

COMMENTS

a(2^n-1)=A078008(n). Conjecture : all elements a(n) are in A078008. A001316(n)=A102395(n)+2*A102396(n).

The conjecture is true since a(n)=A078008(A000120(n)). - Paul Barry (pbarry(AT)wit.ie), Jan 07 2005

FORMULA

a(n)=sum{k=0..n, if(mod(n+k, 3)=0, C(n, k) mod 2, 0)}.

CROSSREFS

Sequence in context: A181391 A082054 A044943 * A127504 A047917 A144569

Adjacent sequences:  A102392 A102393 A102394 * A102396 A102397 A102398

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jan 06 2005

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Last modified February 17 16:13 EST 2012. Contains 206050 sequences.