id:A138341 - OEIS Search Results

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Expansion of (1-4x-x^3)/(1-x+x^2)^2.

+0
2

1, -2, -7, -7, 2, 13, 13, -2, -19, -19, 2, 25, 25, -2, -31, -31, 2, 37, 37, -2, -43, -43, 2, 49, 49, -2, -55, -55, 2, 61, 61, -2, -67, -67, 2, 73, 73, -2, -79, -79, 2, 85, 85, -2, -91, -91, 2, 97, 97, -2, -103 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Hankel transform of A079309.`
	FORMULA	`a(n)=(2n+1)cos(pin/3)-(2n+5)sin(pi*n/3)/sqrt(3);`
	CROSSREFS	`Cf. A138342.` `Sequence in context: A153738 A159790 A016639 this_sequence A153520 A153649 A020770` `Adjacent sequences: A138338 A138339 A138340 this_sequence A138342 A138343 A138344`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 15 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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