Number of relatively prime compositions of n with no 1's.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =0a(7) =7a(8) =5a(9) =17a(10) =17a(11) =54a(12) =51a(13) =143a(14) =168a(15) =358a(16) =482a(17) =986a(18) =1313a(19) =2583a(20) =3663a(21) =6698a(22) =9921a(23) =17710a(24) =26489a(25) =46352a(26) =70928a(27) =121137a(28) =188220a(29) =317810