A059278 - OEIS

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A059278

G.f. is G(x*(1-x)/(1-2*x)) where G(x) is g.f. for Catalan numbers A000108.

1, 1, 3, 11, 43, 175, 735, 3167, 13935, 62383, 283311, 1302271, 6047679, 28332991, 133752191, 635618431, 3038326911, 14599154431, 70474889471, 341624867071, 1662254107391, 8115717976831, 39747223425791, 195219110182911, 961330824858623 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`G.f.: (2x-1+sqrt((1-2x)*(1-6x+4x^2)))/(2x(x-1)).`
	PROG	`(PARI) a(n)=polcoeff((2x-1 +sqrt((1-2x)(1-6x+4x^2)+x^2O(x^n)))/(2x^2-2x), n)`
	CROSSREFS	`Sequence in context: A026671 A026876 A151090 * A151091 A151092 A151093` `Adjacent sequences: A059275 A059276 A059277 * A059279 A059280 A059281`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 24 2001`

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Last modified February 15 12:25 EST 2012. Contains 205786 sequences.