a(n) = A000108(n)*A006130(n), where A000108 is the Catalan numbers and A006130(n) = A006130(n-1) + 3*A006130(n-2).

A200312

a(n) = A000108(n)*A006130(n), where A000108 is the Catalan numbers and A006130(n) = A006130(n-1) + 3*A006130(n-2).

Terms

    a(0) =1a(1) =1a(2) =8a(3) =35a(4) =266a(5) =1680a(6) =12804a(7) =93093a(8) =726440a(9) =5635058a(10) =45063668a(11) =362121760a(12) =2955642508a(13) =24284658100a(14) =201428123040

External references