A159972 - OEIS

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A159972

Row sums of number triangle A159971.

1, -1, 0, 2, -7, 21, -63, 195, -624, 2054, -6916, 23712, -82498, 290510, -1033410, 3707850, -13402695, 48760365, -178405155, 656043855, -2423307045, 8987427465, -33453694485, 124936258125, -467995871775, 1757900019099, -6619846420551 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	FORMULA	`G.f.: (2c(-x)-1)/(1-xc(-x)^3)=(1-x+xc(-x))/(1+x)=(1-2x+sqrt(1+4x))/(2(1+x)), c(x) the g.f. of A000108.`
	CROSSREFS	`Sequence in context: A018036 A007050 A005666 * A106271 A027990 A037520` `Adjacent sequences: A159969 A159970 A159971 * A159973 A159974 A159975`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 28 2009`

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Last modified February 14 15:23 EST 2012. Contains 205625 sequences.