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A106524 Interleave A038573(n+1) and 2*A038573(n+1). 1
1, 2, 1, 2, 3, 6, 1, 2, 3, 6, 3, 6, 7, 14, 1, 2, 3, 6, 3, 6, 7, 14, 3, 6, 7, 14, 7, 14, 15, 30, 1, 2, 3, 6, 3, 6, 7, 14, 3, 6, 7, 14, 7, 14, 15, 30, 3, 6, 7, 14, 7, 14, 15, 30, 7, 14, 15, 30, 15, 30, 31, 62, 1, 2, 3, 6, 3, 6, 7, 14, 3, 6, 7, 14, 7, 14, 15, 30, 3, 6, 7, 14, 7, 14, 15, 30, 7, 14, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums of number the number triangle (A106522 mod 2).

LINKS

Table of n, a(n) for n=0..88.

FORMULA

a(n)=sum{k=0..n+2, binomial(n+2, k) mod 2}-(3/2-(-1)^n/2); a(n)=(sum{k=0..(n/2+1), binomial(n/2+1, k) mod 2}-1)(1+(-1)^n)/2+ (sum{k=0..(n+1)/2, binomial((n+1)/2, k) mod 2}-1)(1-(-1)^n)/2; a(n)=A001316(n+2)-A000034(n).

CROSSREFS

Sequence in context: A070861 A277566 A261144 * A323641 A086582 A033639

Adjacent sequences:  A106521 A106522 A106523 * A106525 A106526 A106527

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 06 2005

STATUS

approved

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Last modified May 30 18:38 EDT 2020. Contains 334728 sequences. (Running on oeis4.)