A118406 - OEIS

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A118406

Unsigned row sums of triangle A118404.

1, 2, 2, 4, 4, 8, 14, 28, 52, 104, 206, 412, 820, 1640, 3278, 6556, 13108, 26216, 52430, 104860, 209716, 419432, 838862, 1677724, 3355444, 6710888, 13421774, 26843548, 53687092, 107374184, 214748366, 429496732, 858993460, 1717986920, 3435973838 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: A(x) = (1 - 2x^2 - 5x^4)/(1-x^4)/(1-2*x).`
	PROG	`(PARI) {a(n)=polcoeff((1 - 2x^2 - 5x^4)/(1-x^4)/(1-2x+xO(x^n)), n, x)}`
	CROSSREFS	`Cf. A118404, A118405.` `Sequence in context: A000013 A064484 A063776 * A072488 A074818 A110199` `Adjacent sequences: A118403 A118404 A118405 * A118407 A118408 A118409`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 27 2006`

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Last modified February 13 08:12 EST 2012. Contains 205451 sequences.