Number of compositions of n in which the least part is even.

Terms

a(0) =0a(1) =1a(2) =0a(3) =2a(4) =2a(5) =4a(6) =5a(7) =11a(8) =17a(9) =28a(10) =44a(11) =75a(12) =123a(13) =203a(14) =330a(15) =541a(16) =883a(17) =1444a(18) =2357a(19) =3848a(20) =6271a(21) =10214a(22) =16624a(23) =27051a(24) =43995a(25) =71523a(26) =116223a(27) =188790a(28) =306554a(29) =497624