Catafusenes (see reference for precise definition).

Terms

a(0) =0a(1) =1a(2) =1a(3) =4a(4) =6a(5) =15a(6) =25a(7) =57a(8) =103a(9) =223a(10) =417a(11) =898a(12) =1722a(13) =3707a(14) =7211a(15) =15620a(16) =30724a(17) =66939a(18) =132729a(19) =290916a(20) =580680a(21) =1279281a(22) =2567397a(23) =5682009a(24) =11456481a(25) =25454265a(26) =51528969a(27) =114880470a(28) =233380592a(29) =521860455