Number of compositions of n if only the order of the odd numbers matter.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =16a(7) =25a(8) =43a(9) =68a(10) =113a(11) =181a(12) =298a(13) =479a(14) =781a(15) =1260a(16) =2048a(17) =3308a(18) =5364a(19) =8672a(20) =14048a(21) =22720a(22) =36782a(23) =59502a(24) =96305a(25) =155807a(26) =252136a(27) =407943a(28) =660113a(29) =1068056