The number of pure inverting compositions of n.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =5a(6) =9a(7) =19a(8) =37a(9) =74a(10) =148a(11) =296a(12) =591a(13) =1183a(14) =2366a(15) =4731a(16) =9463a(17) =18926a(18) =37852a(19) =75704a(20) =151408a(21) =302816a(22) =605633a(23) =1211265a(24) =2422530a(25) =4845060a(26) =9690121a(27) =19380241a(28) =38760482a(29) =77520964