
1, 0, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 3, 2, 3, 3, 3, 3, 4, 3, 4, 4, 4, 4, 5, 4, 5, 5, 5, 5, 6, 5, 6, 6, 6, 6, 7, 6, 7, 7, 7, 7, 8, 7, 8, 8, 8, 8, 9, 8, 9, 9, 9, 9, 10, 9, 10, 10, 10, 10, 11
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OFFSET

0,7


COMMENTS

Absolute values appear to be given (with the same offset) by A103221.  Jason Kimberley, Oct 17 2011


LINKS

Table of n, a(n) for n=0..60.
Index entries for linear recurrences with constant coefficients, signature (0,1,1,0,1).


FORMULA

Conjectured: G.f. 1/( (1x)*(1x+x^2)*(1+x)^2 ) with a(n) = +a(n2) a(n3) +a(n5).  R. J. Mathar, Jun 30 2011
The above conjecture is correct. [Charles R Greathouse IV, Dec 28 2011]


PROG

(PARI) a(n)=(1)^n*(n\2(n1)\3) \\ Charles R Greathouse IV, Dec 28 2011


CROSSREFS

Sequence in context: A306468 A032358 A011960 * A008615 A103221 A026806
Adjacent sequences: A187032 A187033 A187034 * A187036 A187037 A187038


KEYWORD

sign,easy


AUTHOR

Paul Barry, Mar 08 2011


STATUS

approved

