Number of integer compositions of n that are the first sums of more than one composition.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =6a(9) =8a(10) =12a(11) =16a(12) =23a(13) =31a(14) =44a(15) =59a(16) =83a(17) =111a(18) =155a(19) =207a(20) =287a(21) =383a(22) =528a(23) =704a(24) =966a(25) =1287a(26) =1759a(27) =2342a(28) =3190a(29) =4245