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A079225 Number of Catalan objects fixed by four-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees). 4
1, 1, 2, 5, 11, 30, 82, 233, 680, 2033, 6164, 18923, 58768, 184045, 581105, 1846906, 5905364, 18980465, 61292929, 198758704, 646974285, 2113163707, 6923642271, 22749608810, 74946337830, 247499313730, 819154110660, 2716779932308 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..27.

FORMULA

a(n) = A079216(n, 4)

MAPLE

A079225 := n -> A079216bi(n, 4);

CROSSREFS

The fourth row of A079216. The leftmost edge of the triangle A079220 and also its row sums shifted by one. Occurs in A073202 as row 2290625151. Cf. A057546, A079223-A079227.

Sequence in context: A121134 A144959 A131347 * A139466 A139467 A124481

Adjacent sequences:  A079222 A079223 A079224 * A079226 A079227 A079228

KEYWORD

nonn

AUTHOR

Antti Karttunen Jan 03 2002

STATUS

approved

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Last modified December 2 17:24 EST 2016. Contains 278682 sequences.