Inverse Moebius transform of A000031 (starting at term 0).

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =7a(5) =14a(6) =15a(7) =27a(8) =40a(9) =69a(10) =109a(11) =206a(12) =353a(13) =649a(14) =1192a(15) =2219a(16) =4117a(17) =7762a(18) =14603a(19) =27669a(20) =52506a(21) =99991a(22) =190747a(23) =364950a(24) =699259a(25) =1342539a(26) =2581468a(27) =4971721a(28) =9587581a(29) =18514054