Number of compositions of n with some part appearing more than twice.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =5a(6) =11a(7) =30a(8) =69a(9) =142a(10) =334a(11) =740a(12) =1526a(13) =3273a(14) =6840a(15) =14251a(16) =29029a(17) =59729a(18) =122009a(19) =248070a(20) =500649a(21) =1012570a(22) =2040238a(23) =4107008a(24) =8257466a(25) =16562283a(26) =33229788a(27) =66621205a(28) =133478437a(29) =267326999