Irregular triangle read by rows: T(n,k) is the number of flattened Catalan words of length n with exactly k symmetric valleys, with k >= 0.
A372875
Irregular triangle read by rows: T(n,k) is the number of flattened Catalan words of length n with exactly k symmetric valleys, with k >= 0.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =1a(5) =34a(6) =7a(7) =90a(8) =31a(9) =1a(10) =242a(11) =113a(12) =10a(13) =659a(14) =375a(15) =59a(16) =1a(17) =1808a(18) =1189a(19) =271a(20) =13a(21) =4977a(22) =3686a(23) =1082a(24) =96a(25) =1a(26) =13715a(27) =11284a(28) =3976a(29) =534
External references
- oeis: A372875