Number of integer compositions of n that have only one part or whose consecutive parts are coprime and the last and first part are also coprime.

A318748

Number of integer compositions of n that have only one part or whose consecutive parts are coprime and the last and first part are also coprime.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =24a(7) =43a(8) =82a(9) =151a(10) =285a(11) =535a(12) =1005a(13) =1883a(14) =3533a(15) =6631a(16) =12460a(17) =23407a(18) =43952a(19) =82538a(20) =154999a(21) =291088a(22) =546674a(23) =1026687a(24) =1928118a(25) =3621017a(26) =6800300a(27) =12771086a(28) =23984329a(29) =45042959

External references