A079225 Number of Catalan objects fixed by four-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees).

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

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: A144959 A131347 A292210 * A139466 A291139 A139467

Adjacent sequences: A079222 A079223 A079224 * A079226 A079227 A079228

Keyword

nonn

Author

Antti Karttunen Jan 03 2002

Status

approved