Third level generalization of Catalan triangle (0th level is Pascal's triangle A007318; first level is Catalan triangle A009766; 2nd level is A069269).
A069270
Third level generalization of Catalan triangle (0th level is Pascal's triangle A007318; first level is Catalan triangle A009766; 2nd level is A069269).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =1a(7) =3a(8) =9a(9) =22a(10) =1a(11) =4a(12) =15a(13) =52a(14) =140a(15) =1a(16) =5a(17) =22a(18) =91a(19) =340a(20) =969a(21) =1a(22) =6a(23) =30a(24) =140a(25) =612a(26) =2394a(27) =7084a(28) =1a(29) =7
External references
- oeis: A069270