Number of nonempty pairwise coprime subsets of {1,...,n}, where a single number is not considered to be pairwise coprime unless it is equal to 1.

A320426

Number of nonempty pairwise coprime subsets of {1,...,n}, where a single number is not considered to be pairwise coprime unless it is equal to 1.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =8a(4) =19a(5) =22a(6) =49a(7) =64a(8) =95a(9) =106a(10) =221a(11) =236a(12) =483a(13) =530a(14) =601a(15) =712a(16) =1439a(17) =1502a(18) =3021a(19) =3212a(20) =3595a(21) =3850a(22) =7721a(23) =7976a(24) =11143a(25) =11878a(26) =14629a(27) =15460a(28) =30947a(29) =31202

External references