Convolution of A000108 (Catalan numbers) with A020920.

A045492

Convolution of A000108 (Catalan numbers) with A020920.

Terms

    a(0) =1a(1) =19a(2) =218a(3) =1955a(4) =15086a(5) =105102a(6) =679764a(7) =4154403a(8) =24281510a(9) =136887322a(10) =749032492a(11) =3997228430a(12) =20880823820a(13) =107088473660a(14) =540472210728

External references