Number of free subsets of multiplicative group of GF(3^n).

Terms

a(0) =1a(1) =5a(2) =13a(3) =52a(4) =121a(5) =455a(6) =1093a(7) =4305a(8) =9841a(9) =36905a(10) =88573a(11) =348728a(12) =797161a(13) =2989355a(14) =7174453a(15) =28585712a(16) =64570081a(17) =242137805a(18) =581130733a(19) =2288202262