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

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =9a(5) =18a(6) =34a(7) =66a(8) =127a(9) =249a(10) =490a(11) =972a(12) =1936a(13) =3874a(14) =7772a(15) =15623a(16) =31439a(17) =63308a(18) =127506a(19) =256782a(20) =516970a(21) =1040340a(22) =2092450a(23) =4206146a(24) =8449953a(25) =16965459a(26) =34042784a(27) =68272206a(28) =136847328a(29) =274168858