Second level generalization of Catalan triangle (0th level is Pascal's triangle A007318; first level is Catalan triangle A009766; 3rd level is A069270).
A069269
Second level generalization of Catalan triangle (0th level is Pascal's triangle A007318; first level is Catalan triangle A009766; 3rd level is A069270).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =3a(8) =7a(9) =12a(10) =1a(11) =4a(12) =12a(13) =30a(14) =55a(15) =1a(16) =5a(17) =18a(18) =55a(19) =143a(20) =273a(21) =1a(22) =6a(23) =25a(24) =88a(25) =273a(26) =728a(27) =1428a(28) =1a(29) =7
External references
- oeis: A069269