A085223 - OEIS

A085223

Row 1 of A085201.

1, 2, 4, 6, 9, 11, 14, 16, 19, 23, 25, 28, 30, 33, 37, 39, 42, 44, 47, 51, 53, 56, 60, 65, 67, 70, 72, 75, 79, 81, 84, 86, 89, 93, 95, 98, 102, 107, 109, 112, 114, 117, 121, 123, 126, 128, 131, 135, 137, 140, 144, 149, 151, 154, 156, 159, 163, 165, 168, 172, 177, 179

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

OFFSET

0,2

COMMENTS

Gives in A014486 the positions of the plane general trees whose rightmost subtree (branching from the root) is just a stick: "/", thus corresponding to the parenthesizations whose last element (of the top-level list) is an empty parenthesization: (), i.e. in A063171 positions of the terms which end with digits ...10

LINKS

Table of n, a(n) for n=0..61.

FORMULA

a(n) = A085201bi(n, 1) = A057164(A072795(A057164(n))) = A057508(A072795(A057508(n))) = A080300(A085224(n))

CROSSREFS

Sequence in context: A186343 A224995 A091626 * A163057 A242137 A138326

Adjacent sequences: A085220 A085221 A085222 * A085224 A085225 A085226

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 23 2003

STATUS

approved