A072660 - OEIS

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A072660

Size of the parenthesizations obtained with the global ranking/unranking scheme A072656-A072659.

0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 3, 5, 4, 4, 4, 5, 4, 4, 6, 5, 5, 5, 5, 4, 6, 5, 4, 4, 5, 7, 6, 6, 6, 5, 5, 5, 6, 5, 5, 7, 6, 6, 6, 5, 4, 6, 5, 8, 7, 7, 7, 6, 7, 6, 6, 6, 6, 5, 7, 6, 5, 4, 6, 8, 7, 7, 7, 6, 6, 5, 7, 5, 5, 8, 6, 6, 9, 8, 8, 8, 7, 8, 7, 7, 9, 7, 7, 7, 6, 6, 5, 7, 5, 6, 8, 7, 7, 6, 6, 4, 7, 5, 9, 8

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..104.

CROSSREFS

Cf. A072657-A072659. Permutations: A071673, A072643, A072644, A072645.

Sequence in context: A072768 A071673 A174199 * A237720 A075172 A347643

Adjacent sequences: A072657 A072658 A072659 * A072661 A072662 A072663

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 02 2002

STATUS

approved