Number of subsets of {1,..,n} of cardinality >= 2 such that the elements of each counted subset are pairwise coprime.
A276187
Number of subsets of {1,..,n} of cardinality >= 2 such that the elements of each counted subset are pairwise coprime.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =7a(4) =18a(5) =21a(6) =48a(7) =63a(8) =94a(9) =105a(10) =220a(11) =235a(12) =482a(13) =529a(14) =600a(15) =711a(16) =1438a(17) =1501a(18) =3020a(19) =3211a(20) =3594a(21) =3849a(22) =7720a(23) =7975a(24) =11142a(25) =11877a(26) =14628a(27) =15459a(28) =30946a(29) =31201
External references
- oeis: A276187