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

A079225

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =11a(5) =30a(6) =82a(7) =233a(8) =680a(9) =2033a(10) =6164a(11) =18923a(12) =58768a(13) =184045a(14) =581105a(15) =1846906a(16) =5905364a(17) =18980465a(18) =61292929a(19) =198758704a(20) =646974285a(21) =2113163707a(22) =6923642271a(23) =22749608810a(24) =74946337830a(25) =247499313730a(26) =819154110660

External references