id:A056589 - OEIS Search Results

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Third column sequence of unsigned triangle A056588.

+0
5

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; listen)

	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 this_sequence A074407 A121159 A134968` `Adjacent sequences: A056586 A056587 A056588 this_sequence 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 November 25 20:09 EST 2009. Contains 167514 sequences.

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