id:A126304 - OEIS Search Results

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a(n) = number of nodes with nonzero even distance to the root in the n-th plane general tree encoded by A014486(n).

+0
3

0, 0, 0, 1, 0, 1, 1, 2, 1, 0, 1, 1, 2, 1, 1, 2, 2, 3, 2, 1, 2, 1, 2, 0, 1, 1, 2, 1, 1, 2, 2, 3, 2, 1, 2, 1, 2, 1, 2, 2, 3, 2, 2, 3, 3, 4, 3, 2, 3, 2, 3, 1, 2, 2, 3, 2, 1, 2, 1, 2, 2, 3, 2, 3, 2, 0, 1, 1, 2, 1, 1, 2, 2, 3, 2, 1, 2, 1, 2, 1, 2, 2, 3, 2, 2, 3, 3, 4, 3, 2, 3, 2, 3, 1, 2, 2, 3, 2, 1, 2, 1, 2 (list; graph; listen)

	OFFSET	`0,8`
	EXAMPLE	`A014486(27) = 696 (1010111000 in binary), encodes the following general plane tree, where the root is marked with * and nodes with even or odd distance to root with 'e's and 'o's, respectively.` `.......o` `.......\|` `.......e` `.......\|` `...o.o.o` `....\\|/.` `.....*..` `there is one node marked with 'e', thus a(27)=1.`
	PROGRAM	`(Scheme:) (define (A126304 n) (A126304 (A014486->parenthesization (A014486 n))))` `(define (A126304 s) (cond ((null? s) 0) (else (apply + (map *A126303 s)))))`
	CROSSREFS	`a(n) = A126305(n)-1. Cf. A126303. Scheme-function A014486->parenthesization given in A014486.` `Sequence in context: A132966 A037897 A054070 this_sequence A049455 A133734 A109702` `Adjacent sequences: A126301 A126302 A126303 this_sequence A126305 A126306 A126307`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Jan 02 2007`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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