Number of ways to choose n positive integers less than or equal to 2n such that none of the n integers divides another.
A174094
Number of ways to choose n positive integers less than or equal to 2n such that none of the n integers divides another.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =5a(5) =4a(6) =6a(7) =12a(8) =10a(9) =14a(10) =26a(11) =26a(12) =34a(13) =68a(14) =48a(15) =72a(16) =120a(17) =120a(18) =168a(19) =336a(20) =264a(21) =396a(22) =792a(23) =624a(24) =816a(25) =1632a(26) =1632a(27) =2208a(28) =3616a(29) =3616
External references
- oeis: A174094