id:A101488 - OEIS Search Results

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Number of naturally embedded binary trees that have no label greater than 0.

+0
2

1, 1, 1, 2, 4, 10, 26, 73, 213, 645, 2007, 6391, 20741, 68407, 228753, 774162, 2647548, 9138342, 31802118, 111489492, 393442848, 1396771812, 4985732628, 17884908282, 64449398994, 233220788850, 847211744806, 3088649627798 (list; graph; listen)

	OFFSET	`0,4`
	LINKS	`M. Bousquet-Melou, Limit laws for embedded trees`
	FORMULA	`G.f.: [(1-4z)^(3/2)-1+8z-2z^2]/[2z(1+z)].`
	CROSSREFS	`First row of array A101489.` `Adjacent sequences: A101485 A101486 A101487 this_sequence A101489 A101490 A101491` `Sequence in context: A049145 A102407 A049130 this_sequence A089429 A049143 A089404`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Jan 21 2005`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research