Greatest integer k such that k/2^n < phi^2, where phi = (1+sqrt(5))/2 = golden ratio.

Terms

a(0) =2a(1) =5a(2) =10a(3) =20a(4) =41a(5) =83a(6) =167a(7) =335a(8) =670a(9) =1340a(10) =2680a(11) =5361a(12) =10723a(13) =21446a(14) =42893a(15) =85787a(16) =171575a(17) =343150a(18) =686301a(19) =1372603a(20) =2745207a(21) =5490415a(22) =10980830a(23) =21961660a(24) =43923321a(25) =87846643a(26) =175693286a(27) =351386573a(28) =702773147a(29) =1405546295