Atkinson-Negro-Santoro sequence: a(n+1) = 2*a(n) - a(n-floor(n/2+1)).

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =24a(7) =46a(8) =88a(9) =172a(10) =337a(11) =667a(12) =1321a(13) =2629a(14) =5234a(15) =10444a(16) =20842a(17) =41638a(18) =83188a(19) =166288a(20) =332404a(21) =664636a(22) =1328935a(23) =2657533a(24) =5314399a(25) =10628131a(26) =21254941a(27) =42508561a(28) =85014493a(29) =170026357