A056589 - OEIS

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A056589

Third column sequence of unsigned triangle A056588.

1, 4, 16, 53, 166, 492, 1413, 3960, 10912, 29689, 80026, 214196, 570289, 1512300, 3998160, 10545741, 27766942, 73012060, 191785165, 503378480, 1320425536, 3462057009, 9074076786, 23776857828, 62289901081, 163159711492 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)= -A056588(n+2, 2), n >= 0. a(n)= -2^(n+3)+F(n+4)(F(n+3)+1), F(n)=A000045(n).` `G.f.(1-x+x^2)/((1-2x)(1+x)(1-3x+x^2)(1-x-x^2))`
	CROSSREFS	`Cf. A000045, A056588, A000012, A000071.` `Sequence in context: A107767 A087972 A074409 * A074407 A192074 A121159` `Adjacent sequences: A056586 A056587 A056588 * A056590 A056591 A056592`
	KEYWORD	`nonn,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Jul 10 2000`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.