Number of Catalan objects fixed by three-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees).
A079224
Number of Catalan objects fixed by three-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =18a(6) =43a(7) =104a(8) =273a(9) =702a(10) =1870a(11) =4985a(12) =13562a(13) =37038a(14) =102266a(15) =283774a(16) =793189a(17) =2227115a(18) =6286044a(19) =17811751a(20) =50672898a(21) =144639235a(22) =414181050a(23) =1189365940a(24) =3424477813a(25) =9883578364a(26) =28589660227a(27) =82870288432a(28) =240672107114
External references
- oeis: A079224