Number of set partitions of {1,...,n} with relatively prime block sizes.
A318120
Number of set partitions of {1,...,n} with relatively prime block sizes.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =11a(5) =51a(6) =162a(7) =876a(8) =3761a(9) =20782a(10) =109293a(11) =678569a(12) =4038388a(13) =27644436a(14) =186524145a(15) =1379760895a(16) =10323844183a(17) =82864869803a(18) =674798169662
External references
- oeis: A318120