Convolution of Catalan numbers A000108 with A038845.

Terms

a(0) =1a(1) =13a(2) =110a(3) =765a(4) =4746a(5) =27314a(6) =149052a(7) =781725a(8) =3975730a(9) =19730150a(10) =95973956a(11) =459145778a(12) =2165937060a(13) =10095323460a(14) =46566906872a(15) =212857023069a(16) =965208806082