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A166446 Periodic (1,1,1,1,0,0,-1,-1,-1,-1,0,0). 3
1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

a(n+1) is the Hankel transform of A027826.

a(n+2) is the Hankel transform of A110199. [From Paul Barry (pbarry(AT)wit.ie), Jun 23 2010]

FORMULA

G.f.: (1+x)/(1-x^2+x^4).

CROSSREFS

Sequence in context: A130657 A084846 A130093 * A103368 A055132 A128408

Adjacent sequences:  A166443 A166444 A166445 * A166447 A166448 A166449

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 13 2009

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Last modified February 15 07:22 EST 2012. Contains 205706 sequences.