Number of cyclic compositions (necklaces of positive integers) summing to n with adjacent parts (including the last and first part) being indivisible (either way).

A318730

Number of cyclic compositions (necklaces of positive integers) summing to n with adjacent parts (including the last and first part) being indivisible (either way).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =3a(7) =2a(8) =3a(9) =6a(10) =5a(11) =8a(12) =7a(13) =14a(14) =15a(15) =21a(16) =31a(17) =39a(18) =51a(19) =69a(20) =98a(21) =133a(22) =177a(23) =254a(24) =329a(25) =471a(26) =632a(27) =902a(28) =1230a(29) =1710

External references