a(n) is the number of Q-bases which can be built from the set {log(1),...,log(n)}.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =5a(6) =5a(7) =7a(8) =11a(9) =25a(10) =25a(11) =38a(12) =38a(13) =84a(14) =150a(15) =178a(16) =178a(17) =235a(18) =235a(19) =341a(20) =578a(21) =1233a(22) =1233a(23) =1521a(24) =1966a(25) =4156a(26) =4820a(27) =6832a(28) =6832a(29) =8952