Dirichlet convolution of b_n=1 with Catalan numbers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =15a(5) =46a(6) =133a(7) =436a(8) =1433a(9) =4878a(10) =16797a(11) =58837a(12) =208013a(13) =743034a(14) =2674457a(15) =9695281a(16) =35357671a(17) =129646266a(18) =477638701a(19) =1767268073a(20) =6564120555a(21) =24466283818a(22) =91482563641a(23) =343059672916