Number of integer compositions of n in which the least part appears more than once.

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =8a(5) =21a(6) =44a(7) =94a(8) =197a(9) =416a(10) =857a(11) =1766a(12) =3621a(13) =7392a(14) =15032a(15) =30493a(16) =61708a(17) =124646a(18) =251359a(19) =506203a(20) =1018279a(21) =2046454a(22) =4109534a(23) =8246985a(24) =16540791a(25) =33160051a(26) =66451484a(27) =133122753a(28) =266612828a(29) =533839069