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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =12a(7) =16a(8) =26a(9) =35a(10) =56a(11) =74a(12) =117a(13) =154a(14) =241a(15) =317a(16) =492a(17) =645a(18) =998a(19) =1306a(20) =2014a(21) =2634a(22) =4053a(23) =5296a(24) =8139a(25) =10630a(26) =16321a(27) =21310a(28) =32699a(29) =42684