A128056 - OEIS

This site is supported by donations to The OEIS Foundation.

A128056

Hankel transform of A128057.

1, -3, -6, 28, 56, -288, -576, 3008, 6016, -31488, -62976, 329728, 659456, -3452928, -6905856, 36159488, 72318976, -378667008, -757334016, 3965452288, 7930904576, -41526755328, -83053510656, 434873827328 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`a(n)=2^A128054(n)*A128053(n). Hankel transform of A128058.`
	FORMULA	`a(n)=A128055(n)((cos(pin/2)-sin(pin/2))((F(n-1)+F(n+1))(5/6-cos(pin/3)/3)(1+(-1)^n)/2 +(F(n)+F(n+2))(5/6-cos(pi*(n+1)/3)/3)(1-(-1)^n)/2));`
	CROSSREFS	`Sequence in context: A076711 A075088 A102428 * A068808 A068133 A024497` `Adjacent sequences: A128053 A128054 A128055 * A128057 A128058 A128059`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 13 2007`

Content is available under The OEIS End-User License Agreement .

Last modified February 13 11:38 EST 2012. Contains 205467 sequences.