Convolution of C(2,2; n) := A064340(n) (generalized Catalan numbers) with itself.

A067297

Convolution of C(2,2; n) := A064340(n) (generalized Catalan numbers) with itself.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =64a(4) =584a(5) =6144a(6) =70576a(7) =859520a(8) =10909440a(9) =142773760a(10) =1913027840a(11) =26115182592a(12) =361936623616

External references