Number of subsets of {1..n} (including empty set) such that the pairwise products of distinct elements are all distinct.
A196724
Number of subsets of {1..n} (including empty set) such that the pairwise products of distinct elements are all distinct.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =58a(7) =116a(8) =212a(9) =416a(10) =720a(11) =1440a(12) =2340a(13) =4680a(14) =7920a(15) =13024a(16) =23328a(17) =46656a(18) =74168a(19) =148336a(20) =229856a(21) =371424a(22) =615304a(23) =1230608a(24) =1780224a(25) =3401568a(26) =5589360a(27) =9468504a(28) =14397744a(29) =28795488
External references
- oeis: A196724