Generalized Narayana numbers for root systems of type D_n. Triangle of h-vectors of type D associahedra.

A145903

Generalized Narayana numbers for root systems of type D_n. Triangle of h-vectors of type D associahedra.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =6a(8) =6a(9) =1a(10) =1a(11) =12a(12) =24a(13) =12a(14) =1a(15) =1a(16) =20a(17) =70a(18) =70a(19) =20a(20) =1a(21) =1a(22) =30a(23) =165a(24) =280a(25) =165a(26) =30a(27) =1a(28) =1a(29) =42

External references