a(n) = Sum_{d|n} A000010(n/d) * A000045(d-1).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =3a(5) =8a(6) =8a(7) =17a(8) =23a(9) =41a(10) =55a(11) =102a(12) =144a(13) =247a(14) =387a(15) =631a(16) =987a(17) =1636a(18) =2584a(19) =4233a(20) =6787a(21) =11011a(22) =17711a(23) =28794a(24) =46380a(25) =75181a(26) =121441a(27) =196685a(28) =317811a(29) =514712