Number of compositions of n whose distinct parts are pairwise coprime, where a singleton is not considered coprime unless it is (1).

A337665

Number of compositions of n whose distinct parts are pairwise coprime, where a singleton is not considered coprime unless it is (1).

Terms

    a(0) =0a(1) =1a(2) =1a(3) =3a(4) =6a(5) =15a(6) =27a(7) =57a(8) =108a(9) =208a(10) =393a(11) =749a(12) =1415a(13) =2687a(14) =5076a(15) =9583a(16) =18088a(17) =34156a(18) =64511a(19) =121898a(20) =230368a(21) =435460a(22) =823376a(23) =1557420a(24) =2946931a(25) =5578109a(26) =10561987a(27) =20005126a(28) =37902509a(29) =71832372

External references