id:A120580 - OEIS Search Results

Search: id:A120580

Displaying 1-1 of 1 results found.

page 1

A120580

Hankel transform of sum{k=0..n, C(2k,k)}.

+0
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; listen)

	OFFSET	`0,3`
	COMMENT	`Hankel transform of A006134.` `Hankel transform of A098479. [From Paul Barry (pbarry(AT)wit.ie), Sep 19 2008]`
	FORMULA	`G.f.: (1-2x)/(1-2x+4x^2); a(n)=2^n(cos(pin/3)-sin(pi*n/3)/sqrt(3));`
	CROSSREFS	`Cf. A104538.` `Sequence in context: A086468 A125507 A104538 this_sequence A013328 A143462 A042972` `Adjacent sequences: A120577 A120578 A120579 this_sequence A120581 A120582 A120583`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 15 2006`

page 1

Search completed in 0.002 seconds

Last modified November 24 19:42 EST 2009. Contains 167435 sequences.

AT&T Labs Research