id:A014168 - OEIS Search Results

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Apply partial sum operator twice to binary rooted tree numbers.

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1, 3, 7, 14, 26, 47, 84, 149, 264, 468, 831, 1479, 2637, 4709, 8420, 15069, 26987, 48356, 86677, 155408, 278694, 499851, 896594, 1608353, 2885280, 5176183, 9286284, 16660260, 29890069 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to rooted trees` `Index entries for sequences related to trees`
	FORMULA	`G.f.: (B(x)-x)/x(1-x)^2 where B(x) is g.f. of A002572.`
	CROSSREFS	`Cf. A002572.` `Sequence in context: A014153 A001924 A079921 this_sequence A132109 A099854 A054355` `Adjacent sequences: A014165 A014166 A014167 this_sequence A014169 A014170 A014171`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

AT&T Labs Research