Number of integer compositions of n where adjacent parts are indivisible (either way) and the last and first part are also indivisible (either way).

A318727

Number of integer compositions of n where adjacent parts are indivisible (either way) and the last and first part are also indivisible (either way).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =5a(7) =3a(8) =5a(9) =13a(10) =9a(11) =23a(12) =15a(13) =37a(14) =45a(15) =63a(16) =115a(17) =131a(18) =207a(19) =265a(20) =415a(21) =603a(22) =823a(23) =1251a(24) =1673a(25) =2521a(26) =3519a(27) =5147a(28) =7409a(29) =10449

External references