Dirichlet convolution of d(n) (# of divisors) with Catalan numbers.

Terms

a(0) =1a(1) =3a(2) =4a(3) =10a(4) =16a(5) =52a(6) =134a(7) =446a(8) =1437a(9) =4896a(10) =16798a(11) =58896a(12) =208014a(13) =743170a(14) =2674476a(15) =9695727a(16) =35357672a(17) =129647751a(18) =477638702a(19) =1767272976a(20) =6564120692a(21) =24466300618a(22) =91482563642a(23) =343059732248