Number of subsets of {1..n} containing n such that every ordered pair of distinct elements has a different quotient.

A325868

Number of subsets of {1..n} containing n such that every ordered pair of distinct elements has a different quotient.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =14a(5) =24a(6) =52a(7) =84a(8) =120a(9) =240a(10) =548a(11) =688a(12) =1784a(13) =2600a(14) =4236a(15) =5796a(16) =16200a(17) =17568a(18) =49968a(19) =55648a(20) =101360a(21) =176792a(22) =433736a(23) =430032a(24) =728784a(25) =1360928a(26) =2304840a(27) =2990856a(28) =8682912a(29) =7877376

External references