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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =0a(7) =4a(8) =2a(9) =10a(10) =8a(11) =20a(12) =14a(13) =34a(14) =52a(15) =72a(16) =90a(17) =146a(18) =172a(19) =244a(20) =390a(21) =502a(22) =680a(23) =956a(24) =1218a(25) =1686a(26) =2104a(27) =3436a(28) =4078a(29) =5786