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A120580 Hankel transform of sum{k=0..n, C(2k,k)}. 4
1, 0, -4, -8, 0, 32, 64, 0, -256, -512, 0, 2048, 4096, 0, -16384, -32768, 0, 131072, 262144, 0, -1048576, -2097152, 0, 8388608, 16777216, 0, -67108864, -134217728, 0, 536870912, 1073741824, 0, -4294967296, -8589934592, 0, 34359738368, 68719476736, 0, -274877906944, -549755813888, 0 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

Hankel transform of A006134.

Hankel transform of A098479. [From Paul Barry (pbarry(AT)wit.ie), Sep 19 2008]

Hankel transform of A025565. [From Paul Barry (pbarry(AT)wit.ie), Mar 26 2010]

FORMULA

G.f.: (1-2x)/(1-2x+4x^2); a(n)=2^n*(cos(pi*n/3)-sin(pi*n/3)/sqrt(3));

CROSSREFS

Cf. A104538.

Sequence in context: A125507 A198583 A104538 * A205508 A013328 A143462

Adjacent sequences:  A120577 A120578 A120579 * A120581 A120582 A120583

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jun 15 2006

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Last modified February 16 19:48 EST 2012. Contains 205955 sequences.