a(n) = A000045(n) + A113405(n).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =5a(5) =9a(6) =15a(7) =27a(8) =49a(9) =91a(10) =169a(11) =317a(12) =599a(13) =1143a(14) =2197a(15) =4251a(16) =8269a(17) =16161a(18) =31711a(19) =62435a(20) =123273a(21) =243963a(22) =483745a(23) =960725a(24) =1910503a(25) =3803295a(26) =7577933a(27) =15109499a(28) =30143973a(29) =60166553