id:A072771 - OEIS Search Results

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X-projection of the tabular N X N -> N bijection A072764 and Y-projection of its transpose A072766.

+0
10

0, 0, 1, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0, 1, 1, 2, 4, 5, 3, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 4, 9, 10, 5, 11, 12, 13, 3, 3, 6, 14, 15, 7, 16, 17, 18, 8, 19, 20, 21, 22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,7`
	COMMENT	`This corresponds to Lisp/Scheme function 'car' computed with respect to the lexicographical ordering of parenthesizations/planar binary trees (A014486), i.e. with planar binary trees this is equal to extracting the left subtree (from the root), with general parenthesizations equal to taking the first sub-parenthesization of the top-level list, and with general plane trees equal to taking the leftmost branch of the tree (at the root).`
	LINKS	`A. Karttunen, Gatomorphisms (with the complete Scheme source)`
	CROSSREFS	`Sequence in context: A083925 A045830 A078771 this_sequence A095750 A056966 A037846` `Adjacent sequences: A072768 A072769 A072770 this_sequence A072772 A072773 A072774`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen Jun 12 2002`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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