Number of integer compositions of n that are the first sums of a unique composition.

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =2a(5) =3a(6) =4a(7) =8a(8) =10a(9) =19a(10) =24a(11) =43a(12) =56a(13) =96a(14) =126a(15) =211a(16) =278a(17) =457a(18) =604a(19) =978a(20) =1296a(21) =2073a(22) =2752a(23) =4359a(24) =5794a(25) =9104a(26) =12112a(27) =18905a(28) =25168a(29) =39065