Catafusenes (see reference for precise definition).

Terms

a(0) =0a(1) =1a(2) =2a(3) =2a(4) =6a(5) =10a(6) =19a(7) =36a(8) =72a(9) =135a(10) =274a(11) =543a(12) =1084a(13) =2219a(14) =4438a(15) =9280a(16) =18570a(17) =39587a(18) =79169a(19) =171369a(20) =342738a(21) =751221a(22) =1502472a(23) =3328218a(24) =6656421a(25) =14878455a(26) =29756910a(27) =67030734a(28) =134061570a(29) =304036170