Powers of fourth root of 18 rounded down.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =18a(5) =37a(6) =76a(7) =157a(8) =324a(9) =667a(10) =1374a(11) =2831a(12) =5832a(13) =12012a(14) =24743a(15) =50964a(16) =104976a(17) =216226a(18) =445375a(19) =917369a(20) =1889568a(21) =3892070a(22) =8016758a(23) =16512654a(24) =34012224a(25) =70057261a(26) =144301645a(27) =297227788a(28) =612220032